Holy cow this was great! There are some issues, such as health not being shown, but overall this was really well done! One big issue however is that I completely forgot that level swapping was a thing. I remember right before I left and then I played for 10 more minutes or something just running around and jumping while switching levels. Additionally, as a balance thing, it would be more interesting if each character had more attributes than just their attacks and jumps. I found myself trying to swap off of the wizard as fast as possible because it's easy to hit yourself while using them and you only have two jumps. Otherwise this was really excellent for a game jam. Well done!
Edit: Also just wanted to say that the pixel art and music were incredible. I am very jealous by your pixel art and I want to listen to your music on repeat, have a nice day.