Very cool! I got softlocked after unlocking the phage missiles because I could not figure out where to go, and every door just immediately killed me. But the bits that I got to experience were cool!
the missles can open rock walls that are in a few rooms, which another commenter mentioned are incredibly subtle. which is fine for hidden rooms but i also used it for a piece of progression lol, my bad there! i’m glad you liked it otherwise!