You can play through the whole game once just doing regular jumping/exploring. There's 64 cubes in the game, which are the collectable. 32 are acquired mostly through standard indie platformer jumping means. The other 32 revolve around a bunch of cool tricks, like solving alphabets or pushing triggers in time with vibration, or other neat stuff.
If you don't feel like solving for all that crap, the alphabet is fun to solve, but almost completely pointless, you can just play as long as you want until you get bored.