Yes, I'm sorry for the confusion, but only the first level of each character works at the moment. This is a test version to try out the new mechanics with the crates, powerups, movable platforms, and new water mechanics. The other 4 levels will be done by the end of this month. Crates should explode and do damage to the player when they collide with the player's head. Also, you should be able to push three crates at once. Can you tell me exactly how you got stuck between the crates? I would also like to hear about the other bugs you found, and thanks for your feedback!