Played this for the first time over 10 years ago and come back to it from time to time
Private Garden, a quite old puzzle game.
You finish hundreds of puzzles and unlock little stories with pictures.
I admit, the reward pictures are mostly /h/, but most of the time you'll spend on the puzzles anyway and as you see in the webm, that's pretty tame.
the platinum version has all 3 games in it
http://www.dlsite.com/pro/work/=/product_id/VJ005508.htmlsorry, I don't have a download link, but I'll help searching if anyone's interested.