diff --git a/creep.go b/creep.go
new file mode 100644
index 0000000..0d2da28
--- /dev/null
+++ b/creep.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"math/rand"
+	"sync"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type creep struct {
+	x, y   float64
+	sprite *ebiten.Image
+
+	moveX, moveY float64
+
+	tick       int
+	nextAction int
+
+	sync.Mutex
+}
+
+func (c *creep) doNextAction() {
+	c.moveX = (rand.Float64() - 0.5) / 10
+	c.moveY = (rand.Float64() - 0.5) / 10
+
+	c.nextAction = 400 + rand.Intn(1000)
+}
+
+func (c *creep) Update() {
+	c.Lock()
+	defer c.Unlock()
+
+	c.tick++
+	if c.tick >= c.nextAction {
+		c.doNextAction()
+		c.tick = 0
+	}
+
+	c.x, c.y = c.x+c.moveX, c.y+c.moveY
+}
+
+func (c *creep) Position() (float64, float64) {
+	c.Lock()
+	defer c.Unlock()
+	return c.x, c.y
+}
diff --git a/game.go b/game.go
index 50f8482..eca6fe5 100644
--- a/game.go
+++ b/game.go
@@ -31,11 +31,6 @@ type projectile struct {
 	color color.Color
 }
 
-type creep struct {
-	x, y   float64
-	sprite *ebiten.Image
-}
-
 // game is an isometric demo game.
 type game struct {
 	w, h         int
@@ -144,13 +139,22 @@ func NewGame() (*game, error) {
 
 	vampireImage := ebiten.NewImageFromImage(img)
 
+	addedCreeps := make(map[string]bool)
 	for i := 0; i < 1000; i++ {
 		c := &creep{
 			x:      float64(1 + rand.Intn(64)),
 			y:      float64(1 + rand.Intn(64)),
 			sprite: vampireImage,
 		}
+
+		addedCreep := fmt.Sprintf("%0.0f-%0.0f", c.x, c.y)
+		if addedCreeps[addedCreep] {
+			// Already added a creep here
+			continue
+		}
+
 		g.creeps = append(g.creeps, c)
+		addedCreeps[addedCreep] = true
 	}
 
 	ebiten.SetCursorShape(ebiten.CursorShapeCrosshair)
@@ -165,6 +169,10 @@ func (g *game) Update() error {
 		return nil
 	}
 
+	for _, c := range g.creeps {
+		c.Update()
+	}
+
 	// Update target zoom level.
 	var scrollY float64
 	if ebiten.IsKeyPressed(ebiten.KeyC) || ebiten.IsKeyPressed(ebiten.KeyPageDown) {
@@ -229,8 +237,9 @@ func (g *game) Update() error {
 		p.x += math.Cos(p.angle) * p.speed
 		p.y += math.Sin(p.angle) * p.speed
 
-		for _, creep := range g.creeps {
-			dx, dy := p.x-creep.x, p.y-creep.y
+		for _, c := range g.creeps {
+			cx, cy := c.Position()
+			dx, dy := p.x-cx, p.y-cy
 			if dx < 0 {
 				dx *= -1
 			}
@@ -238,8 +247,11 @@ func (g *game) Update() error {
 				dy *= -1
 			}
 			if dx <= bulletHitThreshold && dy <= bulletHitThreshold {
-				creep.x = 1000
-				creep.y = 1000
+				// Kill creep
+				g.addBloodSplatter(cx, cy)
+				c.x = 1000
+				c.y = 1000
+				// Remove projectile
 				g.projectiles = append(g.projectiles[:i-removed], g.projectiles[i-removed+1:]...)
 				removed++
 				break
@@ -284,8 +296,36 @@ func (g *game) screenCoordinatesToLevel(x, y float64) (float64, float64) {
 	return ((x - px) * g.camScale) + float64(g.w/2.0), ((y + py) * g.camScale) + float64(g.h/2.0)
 }
 
+func (g *game) addBloodSplatter(x, y float64) {
+	splatterSprite := ebiten.NewImage(32, 32)
+
+	for y := 8; y < 20; y++ {
+		if rand.Intn(2) != 0 {
+			continue
+		}
+
+		for x := 12; x < 20; x++ {
+			if rand.Intn(5) != 0 {
+				continue
+			}
+
+			splatterSprite.Set(x, y, colornames.Red)
+		}
+	}
+
+	t := g.currentLevel.Tile(int(x), int(y))
+	if t != nil {
+		t.AddSprite(splatterSprite)
+	}
+}
+
 // Draw draws the game on the screen.
 func (g *game) Draw(screen *ebiten.Image) {
+	if g.player.health <= 0 {
+		screen.Fill(colornames.Red)
+		return
+	}
+
 	// Render level.
 	drawn := g.renderLevel(screen)
 
@@ -372,7 +412,20 @@ func (g *game) renderLevel(screen *ebiten.Image) int {
 		}
 	}
 
+	biteThreshold := 0.5
 	for _, c := range g.creeps {
+		cx, cy := c.Position()
+		dx, dy := g.player.x-cx, g.player.y-cy
+		if dx < 0 {
+			dx *= -1
+		}
+		if dy < 0 {
+			dy *= -1
+		}
+		if dx <= biteThreshold && dy <= biteThreshold {
+			g.player.health--
+		}
+
 		drawn += g.renderSprite(c.x, c.y, 0, 0, 0, c.sprite, screen)
 	}
 
diff --git a/go.mod b/go.mod
index 1f1f1ab..100ae5f 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module code.rocketnine.space/tslocum/carotidartillery
 go 1.17
 
 require (
-	github.com/hajimehoshi/ebiten/v2 v2.3.0-alpha.0.20211002105934-2fd97767ff1d
+	github.com/hajimehoshi/ebiten/v2 v2.3.0-alpha.0.20211005153847-3f5d1762bb36
 	golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d
 )
 
diff --git a/go.sum b/go.sum
index 9a98ddf..4575e95 100644
--- a/go.sum
+++ b/go.sum
@@ -97,8 +97,8 @@ github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
 github.com/grpc-ecosystem/grpc-gateway v1.9.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
 github.com/hajimehoshi/bitmapfont/v2 v2.1.3/go.mod h1:2BnYrkTQGThpr/CY6LorYtt/zEPNzvE/ND69CRTaHMs=
-github.com/hajimehoshi/ebiten/v2 v2.3.0-alpha.0.20211002105934-2fd97767ff1d h1:nDvPnkrJU0l6dYoTvboO2/vz+G0yfJIu+qjsim/yGns=
-github.com/hajimehoshi/ebiten/v2 v2.3.0-alpha.0.20211002105934-2fd97767ff1d/go.mod h1:olKl/qqhMBBAm2oI7Zy292nCtE+nitlmYKNF3UpbFn0=
+github.com/hajimehoshi/ebiten/v2 v2.3.0-alpha.0.20211005153847-3f5d1762bb36 h1:zp4kNpTpsWJ9OtUrbPkA9PCLUKk1Y1WHjpMLadVpwOI=
+github.com/hajimehoshi/ebiten/v2 v2.3.0-alpha.0.20211005153847-3f5d1762bb36/go.mod h1:olKl/qqhMBBAm2oI7Zy292nCtE+nitlmYKNF3UpbFn0=
 github.com/hajimehoshi/file2byteslice v0.0.0-20210813153925-5340248a8f41/go.mod h1:CqqAHp7Dk/AqQiwuhV1yT2334qbA/tFWQW0MD2dGqUE=
 github.com/hajimehoshi/go-mp3 v0.3.2 h1:xSYNE2F3lxtOu9BRjCWHHceg7S91IHfXfXp5+LYQI7s=
 github.com/hajimehoshi/go-mp3 v0.3.2/go.mod h1:qMJj/CSDxx6CGHiZeCgbiq2DSUkbK0UbtXShQcnfyMM=
diff --git a/level.go b/level.go
index b87e4a9..5aad8e5 100644
--- a/level.go
+++ b/level.go
@@ -77,7 +77,7 @@ func NewLevel() (*Level, error) {
 			case x == l.w-1:
 				t.AddSprite(sandstoneSS.WallRight)
 			case val < 275:
-				t.AddSprite(sandstoneSS.FloorB)
+				//t.AddSprite(sandstoneSS.FloorB)
 			case val < 500:
 				t.AddSprite(sandstoneSS.FloorC)
 			}
diff --git a/main.go b/main.go
index ae1c07e..d52a2ac 100644
--- a/main.go
+++ b/main.go
@@ -2,14 +2,18 @@ package main
 
 import (
 	"log"
+	"math/rand"
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
 func main() {
+	rand.Seed(time.Now().UnixNano())
+
 	ebiten.SetWindowTitle("Carotid Artillery")
 	ebiten.SetWindowResizable(true)
 	ebiten.SetFullscreen(true)
diff --git a/player.go b/player.go
index af81354..29ec125 100644
--- a/player.go
+++ b/player.go
@@ -13,6 +13,8 @@ type gamePlayer struct {
 	angle float64
 
 	weapon *playerWeapon
+
+	health int
 }
 
 func NewPlayer() (*gamePlayer, error) {
@@ -32,6 +34,7 @@ func NewPlayer() (*gamePlayer, error) {
 			sprite:   uziSprite,
 			cooldown: 100 * time.Millisecond,
 		},
+		health: 70,
 	}
 	return p, nil
 }