Mine is vehicle building games like Stormworks or Scrap Mechanic. It’s so much fun to shoot at your friends with your latest nuclear drone while hiding in your bunker with a better defence system than Area 51 !
I’m very curious about your fav niche game genre !
(I’m sorry for my bad English ^^')
chess roguelikes games are great. Breathe new life into a very comfy ruleset:). Always interesting to see how the design space of chess is expanded
couple of examples https://store.steampowered.com/app/1972440/Shotgun_King_The_Final_Checkmate/ https://store.steampowered.com/app/2065000/Chess_Survivors/ https://store.steampowered.com/app/2096510/The_Ouroboros_King/