Could do with a quit button and also why does eating not improve health? Or maybe improve it over time? Or reduce your food collection bar as healing happens over time? (It just seems a bit odd that the only way to heal is to evolve, which also stops you being able to heal once you reach peak evolution).
It might be nice to be able to improve your damage output or to change shape or to rotate... these could all be evolutions ;)
Either way though, great game :) - Keep up the good work :)