This concept is genious! The execution is unbelievebly well.
I could really see how this would be a game on the app store for $2 that turns up all over youtube because of weird advertisements. Jokes aside, this game feels very well polished.
The ai, or whatever, for the hero is really worked out. Instead of it just flying straight and shooting it actually tries to survive!
It is a little bit easy to unlock the bigger ships, incriesing prizes on anything by around 50% - 100% would already make this a lot more interesting.
Other than that I really have nothing to say about this beside; good job!