Took me a bit to figure out the winning strategy and then it got quite fun! Really nice idea but it's a pity that you don't use the mutation mechanic to win the game. I wish there would a strategic touch to it where you really need to collect good builds and party to win. But I also understand that it's incredibly hard to balance so many things. So if you are to continue with development after the jam, I think it would be a really interesting and fun game to play.
The UI and art are great! The music and sound add to a very nice medieval mood. It would also be nice to add some descriptions to the abilities as not all of them are self-explanatory. I really appreciated the tutorial, helped a lot.
One thing that I would definitely change is the side-scrolling. When I started playing I never would've guessed that you can scroll. Then, I saw a comment about that and realized that you can. But it took me a while of trial and error to realize that you need to move the mouse to the edge of the screen. Maybe it's because I used touchpad but I think there should be an alternative way to do that like A/D or mouse scroll or at least a hint that you can do it by moving the mouse to the edge. But because of this issue the first time I thought that I'm missing a half of the game screen and can't do anything about it.
Other than that, really great game and I really enjoyed it. Great job for 48 hours!