A nice and short game jam entry. I do have to agree with the others that the final boss is a little too OP, mainly because it one has two turns, and two, it always goes before your healer so it can KO who you were trying to heal. I think a small nerf to damage and making it so your healer can go before it would help a lot to fixing that.
Would like to see this idea expanded though someday if wish to do that.