Last month I made Alien Escape on my own in 36 hours at a Digital Jersey hackathon. I wanted something fun and retro that you could play in the browser, so I wrote a canvas engine for it as well. Practising not sleeping helps.
You are a space invader who is escaping earth, all your buddies have been shot down. So chasing you from the left is humans in their little space-ships, while you have to avoid asteroids as you escape.
Apparently, the judges were not very impressed, even though my game was the only functional and complete game. I am not salty. Maybe only a little salty.