Fun to play. Is there a way to recharge the health bar? Levelling up seems to keep the same health as before...
Unfortunately, I didn't get around to implementing healing in this prototype, but it's definitely on my long list of mechanics to add. At this point though, the game just tests how long you can defeat mobs before you run out of HP.
Like in Pokemon, leveling up doesn't regen your health, but you do gain a little bit of it back (and more stats).