I think you have a strong core for this game. I would urge you to consider the following:
- Add SFX for the Ballz! It would make them even more threatening if you can hear them coming up behind you.
- Add SFX for taking damage. I like the pixelation to show the player health depletion, but this would be reinforced and made juicier with a sound cue.
- Add more levels/add more dynamic elements to the levels (e.g. moving platforms, hazards, level falls apart as you go on -- just let your imagination run wild!)
- If you're going for an unsettling aesthetic, really lean into it. Make the Ballz hideous. Make the level grotesque and monolithic. Make the gun unsettling. You could make something that really puts folks on edge in a good way.
All things considered, y'all did a good job. Keep it up!