Team Cats! I liked the art and music quite a bit! I also can't resist a good BEAMMM-U attack. :D
Like others have said, it can be a bit overwhelming in the beginning. Attacking has some weird impact on movement, which was a bit confusing and can break the flow for a arcade-styled game.
Suggestions:
Go with a wave system that gradually introduces new enemy types.
Think fluid for the character movement and attacking. Generally you don't want to restrict the player from movement or options unless there is a really good reason to.
I'd love to play this again with some tweaks, so if you come back to it after the jam, hit me up! :D