Great game, the visuals are really good and consistent with the Gameboy feel, you nailed that! The audio fits in good as well. The gameplay loop is simple but fun and the two different stages are a nice change of pace.
As others have said, 100 days is way too long though, I stopped playing after 3 days because I think I saw everything (?) Maybe 5 would have been better with a miniboss at the end (or whatever you had planned for the Ghoul Moon.)
Also, it doesn't really seem to matter if the guards notice you or if the townsfolk is suspicious, maybe one could have explored that idea further (but the game is large enough as it is for a game jam ofc ^^)