A sneak peek of Pulpino - an even tinier in-game editor made in Pulp!
Moving the cursor "off-screen" makes the HUD show in the editor, but the B button also quickly cycles between tools and the crank will change selected tile. Docking the crank switches to game mode (and undocking it back to the editor).
Not sure how far I'd like to take this. Adding more tiles, certainly, and a HUD for changing rooms on the left. Maybe text input would be cool! I'm not sure how feasible actually saving creations will be - it'd mean a store variable for every tile I guess, which sounds painful!
Edit - and here is the move tool and switching rooms:
