Optimizations and debug options

internal/projectile/projectile.go

@@ -38,10 +38,15 @@ func New(x, y, directionX, directionY float64, config ProjectileConfig) *Project
 }
 
 func (p *Projectile) Update(dt float64, screenWidth, screenHeight float64) {
+	if dt > 0.1 {
+		dt = 0.1
+	}
+
 	p.X += p.VelocityX * dt
 	p.Y += p.VelocityY * dt
 
-	if p.X < 0 || p.X > screenWidth || p.Y < 0 || p.Y > screenHeight {
+	margin := p.Radius * 2
+	if p.X < -margin || p.X > screenWidth+margin || p.Y < -margin || p.Y > screenHeight+margin {
 		p.Active = false
 	}
 }
@@ -50,13 +55,17 @@ func (p *Projectile) Draw(screen *ebiten.Image) {
 	if !p.Active {
 		return
 	}
+
+	drawX := float32(int(p.X + 0.5))
+	drawY := float32(int(p.Y + 0.5))
+
 	vector.DrawFilledCircle(
 		screen,
-		float32(p.X),
-		float32(p.Y),
+		drawX,
+		drawY,
 		float32(p.Radius),
 		p.Color,
-		false,
+		true,
 	)
 }