I've just finished my first ever (even though I'm not a kid) game dev thanks to this superb engine!
It's a simple, yet increasingly challenging asteroids style game - with multiple ships (each with different characteristics) and high score leaderboards on the Scirra Arcade.
Hoping to finish up a mobile version, and an OUYA version in the near future.
Would love for thoughts, feedback, etc - all art is from opengameart.org by Kenney.
*EDIT* - Updated game is now available on GameJolt here:
This version includes GameJolt login and online Leaderboards - give it a blast and prove you're the best!