Enter the Gungeon is a great game, but one of the few issues I noticed is that the different guns (I love the many crazy designs by the way) don't feel very different, with a few exceptions, in terms of damage output.
Enemies suck up way too much bullets, especially in later levels, and the bosses seem almost impenetrable with some of the advanced guns.

So maybe you could tweak that a little, make the enemies less bulletspongey,
or vary and up the kind and amount of damage guns do,
because that would make this gun-ius game even more enjoyable.

Keep up the great work,
Kind regards
Blackjack101

I'd say sure some enemies seem a bit bullet spongey. Maybe a bit of damage tweaking could help there, I think however a few different graphical effects or just difference in knockback (knock-aside?) could help differentiate the guns a bit more. Make it look better as it were.

I were playing with the convict and got the Siren gun, and the only real difference I seemed to feel opposed to the shutgun was that I could fire marginally faster and that the floor got wet. Bit more knockback, maybe a temporary dripping effect or something (no clue if this is a huge amount of work to overlay) would probably go a long way to differentiate the gun.

Indeed some enemies feel a bit bullet spongey, even when you clear a room flawlessly and you think "hey that was really cool, I'm an awesome gunslinger" even in those situations battles seem to drag too long.

Yeah, the standard bullet trashmobs could do with dying after 2 hits of your standard pistol instead of 3 and bosses would be more fun and no less hard if they were less of an endurance test.