So I realized there’s a second ending in this, thanks to peeking at the sprite files.
At the very end, after the final save, once you get the white door to spawn you can backtrack a tiny bit to find a new red door.
Considering how simple the game is, this is something I would never had thought to try if I didn’t see the files for it lmao.
Here's a tiny preview:
Also there’s a few unused sprites in there that are pretty cute, obviously from earlier attempts at the game. I put them together in one sheet here: