A short but enjoyable game! Great work! :] I think in addition to space, using the left mouse button to drop furniture would be nice to have. Perhaps there could also be an item which would be detrimental to use, like a furniture item that would explode causing your tower to topple, as there's nothing stopping players from spamming the spawn furniture functionality - to keep in with the whole furniture store theme, maybe a giant fluffy pillow that explodes into feathers :P