Hehe, another game with AI as the main theme :D
The game is quite hard, it would be great to start into a more player-friendly level with a smoother difficulty curve.
Oh, and please please please, when you create a game, don't forget about players with AZERTY keyboard!
WASD is very not convenient, making the game even harder for us :(
That's said, I check the source code on GitHub and it's very clean! I wonder why you didn't participate to the js13k challenge, it seems your code is not heavy at all... Maybe because of images?