It's really unforgiving, one shot and you restart the whole level. I think this would be fine if the camera was zoomed out a bit to be able to see the monsters before they shoot at you, or have a health system. Arrow keys and mouse is also a weird movement scheme.
The movement (not controls) are also super slidey and feels sticky when you run into a wall.
I think the art looks alright though
Also don't know if this is a bug or not, but me and a friend didn't know what to do next after killing the enemies in one level. We went to the hole but nothing happened