Nice game, i really like the music. The visuals and especially the color scheme doesn't really fit to the energetic game. Maybe also make some cool lighting fitting the music. I noticed that you had problems with the characters going through walls, so here a short checklist if you haven't done all these things yet:
Add a rigidbody 2D to all the characters.
Set interpolation to "interpolate", collision to "continous" and sleeping mode to "never sleep".
The sounds were also well chosen, but a bit too loud for me.
I hope i could help you a bit with my feedback, if you have the time maybe check out my game too, thanks. :)