Changes:

- separated entities spriteset from primarymap, which only contains
  tiles
- fixed star obstacle

components/velocity.go

@@ -60,7 +60,7 @@ func (velocity *Velocity) InvertDirection() int {
 	case North:
 		return South
 	case All:
-		return Stop
+		return All
 	case Stop:
 		return Stop
 	}