I just beat Utsuho Reiuji, final boss of Touhou 11.

Particularly exciting because Touhou 11 is the hardest one made thus far. Only the Extra stage bosses are harder than her, which means this is pretty cool.
Oh, and did I mention the pure awesome of the fight with her? She has total control over
nuclear fusion, meaning her primary means of attack is throwing SUNS at you! Not to mention that the fight takes place within Hell itself (or, rather, what used to be Hell, then it got moved and the fires died out, but then Utsuho swallows a god and relights it... Touhou has really strange storylines).