Awesome game! Colors are great and that post processing (the vignette and the slight curvature) really does a lot!
You need to find a way to avoid ties, though! That can happen very easily at the moment. It's too easy to wall yourself in, run away for ever or just end up in a position with no more bombs. The solution I'd suggest to fix this is: Whoever reaches the center of the map with his safe instantly wins. That will add some additional strategy and avoid most of the tie situations.