Losing speed after hitting an enemy made it hard even in second level on the arena :) The gui of the shop was amazingly complex (in a good way!) comparing with rest of the game, so extra congratulations to whoever was responsible for that :) The controls felt a little bit like ice-skating, but I guess that might have been intended. Once I got used to that it was fun, I liked it :) Btw, playing on BIIIIIIG screen the controls popup from the button in the main menu opened so small I almost missed it :P