The aesthetic here is really well played - I can't help but feel like it needs something more though. As someone else mentioned, the different bullet types could have played more into it - such as enemies that are only vulnerable to certain kinds of ammo, or some way to refine the gunplay so fanning the hammer isn't the dominant strategy.
All in all, really fun lil shooter with some nice feeling movement, though it is possible to get mobbed at the room start door and locked in by the melee enemies before you can react.
Or so I've heard. Definitely didn't happen to me.
Definitely didn't then shoot myself with a rocket.