I really like the implementation of the theme. The companion is doing really a lot for you and also he is an important part of the gameplay.
The graphics are well made and the enemies are very creative ^^. I would like the graphics more if there would be shadows.
The game itself kept me going for a while because it was fun to dash around and kill the waves. But it would be nice to have more motivation for continuing. Like upgrades or at least having a wave-counter.
But besides that it is a really nice game with a great use of the theme :-)