Very nice and responsive game! The controls were smooth and the characters felt very easy to control! After playing through a few levels, I noticed the hitboxes were a little too wide, sometimes I'd jump over an enemy and one of the characters would just die even though they didn't touch an enemy.
Two things I think you could add in to improve the responsiveness of the movement is to add a little squash and stretch when you jump, it's a small detail that can make the game feel very nice to play. Second thing is coyote time, which is pretty much a small window where once you leave a platform, you have a change to jump. Both of these things are just little improvements you can add in post-jam and don't really add much to the gameplay, but improve the game feel!
That's all from me, nice game!