Thank you for playing! I was working on Chapter 2 but took a break this year to focus on another project.
I've been thinking of making the first crawlspace treasure chest not having a secret sprite, to encourage you to experiment with crawling in and discovering it more naturally. Originally I kept it like that to encourage going back through it in later versions (when you have more items for finding things with backtracking), but I can see it mostly ends up being a weird tease.