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Party Hard! try it.

Warhammer 40000 Space Marine!!!

I think Transistor was short? Also the revived Tomb Raider game was short but great. Also this is 8 hours but I would STRONGLY recommend playing The Wolf Among Us because holy moly was it amazing. I would probably say its one of the greatest story driven games of all time in my opinion. It was only 8 hours on my playthrough though. It could be shorter. But only an hour shouldn't stop you from trying it, It is AMAZING!

Size always matters!

Portal is rather short but good

Blackwell series (first two games around three hours, the last - longest - around 7) , Rollers of the Realm (5 hours)