Ever get the feeling you've already done a game..?

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Over in SmileBASIC, I've been trying to come up with an interesting twist on the usual Platform-Collection thing.
Instead of having three pickups, there are three switches which you have to toggle in the correct order, which then opens the door.
But..
Dang, if it doesn't look incredibly similar to something else I've done recently, and the most annoying thing is I can't figure out what it's reminding me of!!

No matter. Time is of the essence. I'll finish it off, release it, and then no doubt get an influx of people telling me which of my own games I've just cloned!