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The last singleplayer demo I've played was "Twisted Tower" which is heavily inspired by the Bioshock games, so of course I had to check it out 
I totally love the vibe of the game and the visuals are awesome.
I'm not quite convinced by the story, but I'll keep a close look on the game 
https://store.steampowered.com/app/2506090/Twisted_Tower_Demo/
store.steampowered.comTwisted Tower Demo on SteamBlast your way through an abandoned theme park crawling with fairy-tale mascots, twisted puzzles, and deadly traps. Uncover the dark secrets of your past as you race to the top to win the prize and the love of your life.