I just downloaded the game. Very cool! I wish I has written it... oh wait... given that I wrote Gambit, in a sense I wrote most of the game! It gives me a warm fuzzy feeling!
Your in game REPL is neat. For developing games, where there's a need to explore variations quickly, it is a powerful tool. I'm currently working on a remote REPL for Gambit-JS, so that you can remotely debug Scheme code (possibly games) running in the browser.