Great game! I was confused at first because I thought there wasn't an indicator of HP. Then I played again and saw the bar in the lower part of the screen. It's my fault that I didn't pay more attention, but a different shape (hearts…) or some text might have made it more clear. It's a bit confusing too, that it increases instead of decreasing, it gives “power accumulation bar” vibes.
Anyway, the game is just fun, and it kept my concentration all the time, in a good way.