There are engines you don't have to buy if you're interested in working on games with something like Construct 2, this page provides a pretty good resource list: http://www.newgrounds.com/wiki/creator-resources/game-dev-resources
I like the image! And I do agree it'd be perfect as a game, though you might want to make the main character stand out a bit more from the background. Maybe he could be the one esception to the color scheme? On the top of three blues, I actually spot four, and white. :) Anyway, good luck; keep up the good art!