Going through Charlie Murder and enjoying it

Gonna play TMNT Turtles In Time, after that, any good beat em ups , Steam, Retro, or elsewhere?

my favorite ever is the alien vs predator one. really fun variety where the main girl feels like you're playing marvel vs capcom 2 and the other characters are more beefy or focused on guns. it just never gets boring.
other than that i think modern ones are usually better because they focus on replayability and choice. everyone mentions scott pilgrim, streets of rage 4, fight n rage etc. i'll shill double dragon neon. feels very classic but you have assloads of moves and great customization. the special dodge move is a lot of fun and the dialogue is legitimately great too.

I recommend beating up @Mfan168 either verbally or physically.
Usually gives me 5-10min of enjoyment.

underrated ones that are def worth playing -

violent storm - basically konami taking the piss out of final fight. legitimately one of the most kickass soundtracks ever also, its full on 90s cheese and it rules
ninja baseball batman - its gotten more attention bc of avgn, still really good tho. it's one of those games thats wacky and crazy but it believes in itself 1000%
battletoads - the arcade battletoads. surprisingly a lot more violent and bloody than the console battletoads games but thats a lot of what makes it so good

I unironically like how the 3DS Senran Kagura games play.

I unironically like how the 3DS Senran Kagura games play.

sk2 is great esp with coop but the first one is pretty ass imo

Castle Crasher if for whatever reason you've not tried that yet. super casual.

Streets of Rage 4 + DLC. the DLC makes it more worthy as they add really good characters in the mix. it plays pretty decent on normal but if you want to kick it up a notch mania will test your skill set.

Double Dragon Neon. also sexy fun