This game was unfortunately too difficult for me. The black balls that shoot at you from offscreen and the fact that you lose health over time was too much to deal with. Also, it seems like purchasing upgrades only applies to the next life? Not sure if that's intentional, but I'd imagine those would be permanent. Wish the chest opening noise was a bit quieter and I also found it weird that you need to shoot them twice to remove them. Game seems to have some promise, but would like to see the difficulty toned down.