PROS:

+ Shooting mechanics has lots of potential
+ Cool looking sprites
+ Impressive that this was made in under 4 hours

CONS:
- A bit buggy :(
For some reason, when I moved the character past my cursor, the gun flipped and I was shooting backwards.
I do not know if this was a bug or not, but I think you can utilize this by making this a physics-based gameplay mechanic, where you could shoot those Eye Monsters using bullets that bounce of tiles and platforms.

This game has potential; just requires some polish and you'll have a great game! :)

Really cool eye sprite! I think there's some interesting twin-stick shooter stuff you could do with this.

Cool eye monster sprites! if you polish the shooting (now you can only shoot in one direction) and the jumping, you could make some cool levels.