Tied for my favorite Touhou game with 12. Like that game, this has some of the best spellcards, music, characters, and general atmosphere and flavor.

It's one of the simplest games in the series, but I like how punishing it is. Power and bombs are one resource like in 10, but you can only get life pieces from clearing or bombing spellcards - you won't get one if you die. Scoring is simple too, mainly based off grazing which returns after being absent in 10 for some reason. It's all pretty basic, but the extremely strong bullet pattern design makes up for it and that's ultimately why I think of 11 so highly. Just a really well-executed, well-designed game