Great game! Lots of content, a real test of skill. Graphics are great, animations are smooth. Gameplay is awesome. Really fun. Basically, really good game! I have heard a few people talking about a glitch where the screen goes black with a metal thing at the top and then you cant get back... you can, you just have to press escape. Save data is not deleted, although it will be for that level. Bare in mind if it is a boss level, you can go straight to the boss fight.