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What do you mean by "sparingly?" Is it small time needed per session, or no need to play again after the first session?
If the former:
>Devil Daggers
>HYPER DEMON
>POST Void
>Super Hexagon
>Half-Life (death match)
These can all be played in <10 minute sessions yet feel far longer because of high action, small spin-up with no long-term goal other than get a higher score
If the latter:
>Visual Novels
>Horror Games
Both of those genres can often be kind of short and are only really made for one playthrough in a lot of cases, so you can finish them in like one 4 hour session without need to return
