Fun fact I still haven't done a Normal 1cc of a Windows 2hu except Touhou 19, but that one doesn't count because of the brokenly easy characters (like Reimu) coupled with the simpler requirement (compared to Touhou 3 or 9) to win a match there and a new mechanic where getting hit doesn't lead to losing health (unlike, again, TH03 or 09) but instead your "shield" disappearing (and if you get hit while in that vulnerable state then yeah you lose health) which you can regain by doing a level 3 or 4 attack

Meanwhile I've Normal 1cc'd Touhou 2 to 5. Touhou 1 is a different beast tho (it's not a vertically scrolling bullet hell at all but rather a weird hybrid of Arkanoid and bullet hell without the infamously tiny Reimu hitbox)