Omg is this a cute game, the creature names/designs are GENIUS and absolutely adorable, you really nailed the visuals of this game, definitely the cutest I've seen so far.
Now onto somethings I might tweak, I was a tad confused by the UI of the enemy, when I hovered over them I could see their Attack and Defense stats but there was also a dagger with a number or shield with a number to the left of them and I'm not sure what that means if its not their stats. I also think once you have more abilities for each creature the defense/health/attack boosts will get more interesting (especially if some of those abilities influence health/defense, like a vampiric strike that heals you and damages them, or a hardened bone ability that scales your defense for one round). It might also be fun if you unlock creatures by rescuing them after certain levels? I also definitely wish there were a few more ways to heal in between each round or sub out with a different creature for a round if its got better stats in one area but for the scale of game jam I think you did a really really great job. Really a stunning game, very impressive.