EroTrapSweeper is a fav of mine, it's a minesweeper-like game and while not the most challenging in the world at first, it can get difficult in the later levels.
I dont get the puzzle tag, I guess theres many games that have great puzzles that dont have it or something. Like Barony Sengias games have great puzzles and you have to actually figure out how to do things.
Not 100% I'd call it puzzle, but Aurelia (https://f95zone.to/threads/aurelia-v0-27-1-mirthal.11657/) has alot of gameplay in minigames and excellent pixel art hentai. Some of the mini games are puzzle based, especially one from the latest updates.