Fun, but a strain >_<
Fun and challenging, didn't actually realise how much time had gone by since level one. my only major gripe would be the main controls on the left hand side of the keyboard. I wouldn't think for many players the left hand is more dominant, and this has left me with an achey forearm. That being said it's good that there're games out there that show fairplay towards lefties.
Perhaps if it were possibly to have dual controls (ie utilising the keyboard arrows as well as the W,A,S,D buttons it could be more accessible.
Still, overall a very good game. I'm off for a rest.