It was a really fun game. II loved the minimap at the top.
I would suggest that you allow some time at the start of each room for the player to survey their surroundings, or have larger rooms/better placed enemies. As sometimes when I entered the room from the bottom or top, I would immediately get hit which was quite annoying as I couldn't predict nor do anything about it.
Also an ESC to quit game would be nice rather than bringing up task manager