So, a few things.
1. I get that tutorials aren't the easiest thing to include within game jam constraints, but it would have been nice to at least have a summary of what's happening and what you're trying to do in the game description. I spent my whole first game thinking that the slime on the left defeating the guy on the right was what I was supposed to do, because...I don't know, I just subconsciously assumed the one on the left was the player character.
2. I have no idea what's going on. When does a heart heal the slime, and when does it heal the guy? When does the sword make the slime attack, and when does it make the guy attack? Do the shields do anything? Again, the game description would have been a good place to put this.
3. The "try again" button doesn't work.
4. It's kind of weird to include a mute option on a game that doesn't include sound. I assume music/sound effects were planned and you ran out of time?