A pretty decent run-and-gunner. I kept automatically unlock new characters with each new game start, but other than the ninja's machine gun and the pirate's revolver, I think the differences in characters are entirely cosmetic?
The only time I took damage in the game is right as a room starts and the camera is catching up to it. Enemies either have time to shoot at me or swarm me before I have any time to react, which is unfortunate.
The mini-map felt too large for the information it provided (although I do appreciate that you can open the full map). There is no need to show the character's position in the room on the mini-map when the camera shows the entire room. Simply show the room's connections and which room you are in (Metroidvanians tend to do this).