There's nothing critical I can say. The controls are like butter, the characters are interesting, the premise and the look and the levels are all interesting. The upgrades are nice. The first game seems like it takes forever, but then afterwards to win all the metals the game is pretty fast to beat over and over again. In a lot of ways it reminds me of "Another World"/"Out of this World" because how fun it was to keep beating it over and over. The music is awesome, the sound effects are all high quality. The options menus are full, you can replay the game starting at any level. This is a really extremely high quality game.