COOLO FORVER, a typoed version of the words "cool" and "forever", is my second game, and I've been working on it for a little while now.
It's a little different to your average Flash game in that it's a co-op puzzle platformer, but played on the same keyboard. One player uses WASD, and the other uses the arrow keys. While this started out as an easier method of implementing co-op into a game, I realised that it also encouraged friends to hang out IRL to play the game with each other, which is cool.
Don't worry if you want to play it solo - I actually test it both with a partner and without, so I'll ensure it's soloable, if a little more tricky. The positioning of the controls make it pretty comfortable to solo, if anything.
I'd like to have the game done before the end of August, so keep an eye out for any future updates.