TouHou Makuka Sai ~ Fantastic Danmaku Festival has been released on Steam. This is not from the creator ZUN, who you usually would associate TouHou with. But this is from a smaller developer called 東方幕華祭制作组 (Oriental Umbrella Festival Production Team) with developer StarX.
This is not a new game, it had already been released in 2014 and was (and is) available freely for download. As of version 1.05 it is paid.
The game, in general plays, a lot like what you would expect from the TouHou games. Worth a try, the price is not too bad.