'96 Grid Runner on PS1 is a hidden gem I've only seen mentioned once somewhere. It doesn't have the rights to be that fun, since it is basically just a mix of tag and capture the flag.
Fireburst is a racing game powered by Unreal Engine. One of a kind, I guess. Not without flaws, but quite decent little arcade, do not even remember how I've found it and never saw it mentioned anywhere.
WarDogs Red's Return is the best way to spend the evening if you like beat'em ups and got through all the known ones. Game goes by less than a dollar on Steam sales, and even though you might be off-put by rather cheap graphics, I find that they kinda works when in motion rather than on screenshots. Plus, the game actually very well balanced... or so I've thought. Either way, I found it fun, so it counts.
Aaaand Pine, perhaps? I think it is more know than the others, but, well, why not. It is definitely the biggest one, since all the above once are rather small arcades. This one though can take about a week of evenings to complete all at a slow, relaxed pace and explore every part of it. It is easy to criticize it, but it is equally easy to concentrate on the good parts and enjoy it. I've seen people compare it to Zelda, but I've never played Zelda, so I can't say anything about it from this point of view. Overall, it's middle grounds, but I think it's cool. I'd say if you launch and dislike it, you turn it off, delete and forget. If you launch and like it, then click your fantasy on and let it fill all the empty spots. My fantasy does work like that, so I've enjoyed the game and quite so. Also, Kickstarter code is THANKS4BACKING - yep, just like that. Alternatively, edit settings.xml in Your_User_Folder\AppData\LocalLow\Twirlbound\Pine and change activatedCodes parameter to 1. Savegames are also plain text and easy to edit, if you need it for some reason.
That's all I have from the latest batch.