I would not think of a horror game for a shoot em' up, however this works really well and adds to the frustration and fear you feel when you are surrounded by multiple enemies. The atmosphere is what really stands out about this game and the two animations in the beginning made me jump every time! The animations are very creepy and add to the player's fear as more enemies crawl in. I would say the game difficulty could use some adjusting because I couldn't finish the game. I think the level changes are good and the pixel backgrounds are simple and look clean. To keep the player on edge you could add different enemies or a different attack style to keep surprising the player even if they have to keep replaying to pass a level.