Oh damn, didn't even realize you could dodge gungnir by dashing away in the opposite direction. Thought I had to be really close to Remi so I could get a big enough angle to avoid the tracking. Just completed the game on normal as my first touhou game. You make it look easy even on lunatic.
I couldn't tell if you knew or not by your comment but just in case, the dashing only blocks the gungnir because reisen creates an illusion when she does it, I actually hadn't noticed for a long time and just thought the game had invincibility on the dashes.
i remember dying to cirno a lot of time because i cant dodge her perfect freeze but when i successfully defeat her, she wont turn into the sub char which mean i cant progress, at that point i realized that, im fucked