Hi, I've put a bit of time into this and thought I might offer a bit of constructive criticism:
- The fact that most characters' sprites are vertically-oriented makes it feel unusual for a horizontal shooter from the get-go, but putting most of their hitboxes on their lower halves was particularly difficult for me to get used to.
- Even when I was managing to keep an eye on the hitbox, oftentimes either the flashy effects of my charge shot, enemy explosions, and/or pop-up score numbers would end up obscuring my character and/or an enemy's attacks, causing me to lose my place.
- In similar fashion, while hostile bullets are usually easy enough to keep track of, the enemies themselves, particularly the frustratingly relentless tent dwellers, are frequently able to sneak through the chaos undetected and bum rush me; also, when recovering from a death the bloodstain effect tends to make it difficult to get a bead on my position before the invincibility runs out, frequently leading to a quick repeat death.
- Most of the treasure chest items you find seem to just increase score, but I think some do other things; it's hard to tell, though, since you just grab a whole bunch at once and move on quickly to avoid being swamped. Is there more to pickups than points, or am I imagining things?
Hopefully most of that makes sense, let me know if I need to elaborate on anything. Thanks for sharing so much free stuff with us, hope you're able to enjoy the holidays coming up.