how about adding the back arrow to move backwards. could be slower than going forward if you like. Also, how about making the machinegun a bit less random. maybe 50-75% of the spread it is now. My other little thing I think would be *very* cool would be to have your player squish around a little bit. not as much as the cells, but enough to be noticed while maintaining control stability.
Like the explosion fx :)
Like the explosion fx :)