Very clever and intuitive, with some funny dialogue and a fantastic soundtrack. My favourite part of this game is the quantity of content. The game itself is only 2 hours, and in this time it explores all the concepts introduced fantastically, never feeling like it dwells too long on any particular mechanic. Players can easily end their experience there, having played one of the best indie games ever made. But, there's so much more content for them there to try out - hidden collectibles, the secret lab, score challenge, time trials, no death mode - supplying hours more of awesomeness. My main criticisms of the game are a couple of odd difficulty spikes, and the aesthetic design occasionally looking empty.