Thanks you playing and commenting! This is an amusing bug which I left in because it is useful: the player can "squeeze" through narrow passages. I may create a new sprite that illustrates that it is happening, so it doesn't feel like a bug.

Thanks for playing and commenting! Probably what comes next is making it so NPCs can climb toward you, and I'm adding the ability to set traps for them.

Thanks for trying it out! I'll be adding ladders and/or grappling hooks (so the NPCs can climb up toward you!) soon, which will make it much more... game-like.