/ub Touhou 15 is one of my favourites and it has a game mode where your progress is saved between stages so if you fail you can always resume without starting the entire game again so it’s easier to learn without too much frustration.

/rb Touhou R34 is the best, look it up 😏😏😏

I personally recommend Mountain of Faith (Touhou 10). It doesn’t have any complex extra mechanics, and you can also buy it digitally on Steam which is a plus.