Why, oh, why not use "C" for flying? It's so easy to accidentally double jump when gliding among electric fences... (Apart from that, it's a great sequel to Robot Wants Kitty.)
Thanks for the feedback. The game was made for a 48 hours coding competiton on Reddit, that's why it's so simple. If players see potential in it, I could further develop it, like more species of aliens eating each other and stuff. :-)