I'll admit, I'm a bit confused. I ran around for a little while, bumped into the enemy, and won. Is there more gameplay than that? I mean, the game looks really cool, but from what I saw, there wasn't that much gameplay. If I'm not mistaken, I don't think there's a way to lose. Either way, it looks cool, but it's not much fun.
Also, I'd like to mention that trivial-gamekit isn't available from Quicklisp, so you should probably include instructions for adding that in your README.