hey I don't know if you plan to continue developing your game afterwards but in doubt:
-Is it normal that in the third room there are so many enemies spawning in a row that it is impossible to cross it?
-I have the impression that the eyes can see you through the wall, is that normal?
-An automatic reloading of the weapon when more bullets would be greatly appreciated.
-Also made sure to prevent enemies from spawning on the player.
Besides that it's a very good little game that can grow into a bigger one.