I didn't immediately realize you had to pick up coins to get upgrades so the pacing felt really slow at the start, coulda helped a lot for more incentives to make picking up coins obvious and satisfying. I enjoyed the weapon mechanic where based on you're shooting direction you get a special effect to your bullet which made lining up shots more engaging. Was really easy to get through, more enemy varieties like an enemy that shoots you could've helped a lot in that aspect.