This project looks awesome! I really like art, and it's exceptionally cool that you're using Common Lisp. As someone that often gets lost in the engineering (aka "fun") aspects of building things, my one piece of advice would be to make sure you put enough energy into marketing your game to ensure it reaches as wide an audience as possible and none of your efforts go to waste. Looking on reddit, I see a lot of posts in r/lisp, which is cool, but I'd work towards building as much buzz as you can in the indie gaming community (little teaser videos, etc). I'd also consider posting on the Tigsource forums, as that's a good way to build roots in the indie community. Anyway, looking great, and best of luck with your launch!
Thanks! Yeah, marketing is definitely a weak point, in large part because it's just something that goes very much against my character. I've tried posting to reddit before, but most communities' strict posting rules about promotions make that a pain, or simply not worth bothering with due to low conversion rates.