Once was in the double fat bat room in the bottom right. The other was, if I remember correctly, taking the right locked door with the snakes that leads to the 4 slimes. I got stick (again) in the bottom right while jump dashing over that bottom pit area to get across.
Yeah, I plan on adding more floors, enemies, puzzles, potentially getting to a steam release. I've been meaning to make a top down Zelda-inspired game for a while, this is definitely a project I see a lot of potential in.