Pfff... for the last weeks I was considering designing a game like this (or more exactly, like this may become if the goal is to produce certain waveforms, light up certain LEDs at certain time, power up various stuff in a given order, etc.) and was about to start.
You should do it! I doubt I'll decide how to turn DLS into an actual game sooner than you are able to build yours :)
One of my ideas is similar to what you describe but with more complex cases (I can't think of anything simple that will make sense). E.g. controlling traffic lights.
Caramba! Missed again!