I like this concept and the execution is smooth. The graphics work well and the difficulty curve, while there is easy to overcome. Well done!!
If you wish to persue it i recommend having movement be grid based as a lot of my deaths felt "undeserved" thanks to knowing what I wanted to do but moving around a corner too quickly for example and hitting the wall.
Do me a favour, play re-destine and let me know if you have any tips for the difficulty curve, we had a few problems trying to get mechanical difficulty right.