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Do ever do any game jams? Those might be exactly what you are looking for.

I can second that, game jams got me back into enjoying gamedev. Try joining https://globalgamejam.org happening at end of January.

Haven't gotten around to that yet, but the idea has been brooding for a while...

Go and do some! I find it scratches exactly that itch. Best part is: When the game jam is over, the project is finished!