The game looks and sounds amazing, but it's too repetitive and not exciting in general. It's not that levels are hard (well, they might be hard for casual players, but not for someone who played "I Wanna Be The Boshy" like me), levels just aren't intuitive (don't have any idea where to go) and collecting more coins for no reason isn't really motivating.
If you ask me, the first thing you would wanna fix in this game is the way your character moves and jumps. For metroidvania or action platformer like this, smooth movement is the worst thing, it should be accurate and responsive, without any interpolation of position.
For jumping, you should implement "the more you hold, the higher you jump" mechanic to make it possible for player to reach enemies the way they want to.
Also, I don't think spreading bullets really make gameplay better in any way, so you might also get rid of that mechanic... Or make different weapons, so players could choose what to use in what situation, that could add more variety to gameplay for sure.
Overall the game has potential to be much interesting than it is right now, but good job that you made it in 7 days!
Be sure to rate my game and leave some feedback too :)
https://itch.io/jam/blackthornprodgamejam2/rate/379272