I started toying with the idea of a game like Master of the Monster Lair (AKA Dungeon Maker), but for the Game Boy. Not something I'd actually try to make, but it's interesting to think about how it might work on more limited hardware.

The main issue I found was that it's hard to differentiate between different room types. With so little space to work with, I ended up just putting a small symbol in the corner of each room and leaving it at that. It's functional, but just barely.