It's a great game. Simple side-scroller. They don't do a very good job of explaining everything with the game, but with a few videos online, you can figure everything out. There isn't really a game over, but if you die, you start from the beginning again. If you make it to certain checkpoints you can make yourself slightly stronger for the next attempt and unlock new weapons/abilities. Doesn't take much time to figure things out and get the hang of it, but it does take a really long time to get good and that journey is incredibly satisfying.