I like that the game sort of went in stages, first from "Wait, what am I doing?" to "Oh, I need to reveal all the rooms" and finally "Ok, how do I make a stage to collect the keys and reach the end?". I also tried to figure out if I could softlock myself, but was happy to see that wasn't a possibility.
I would have liked to see more puzzle elements to it, a few of the rooms seemed a bit redundant; maybe a room which let you go back up one room to allow for backtracking could have opened up more possibilities for puzzles, but the game was short enough that it didn't outstay its welcome.