I like the idea of having to hit specific parts of a boss to deteriorate it more in order to defeat it! I appreciate the tutorial so I could get more used to the mechanics of the game, which was nice. It was a bit hard trying to get the last red gem, I saw in a comment you have posted that he flips around eventually, but I don't think I was able to see a time where he flipped around. Overall, a really cool concept for a game!