I have to agree with Brogrammist here, the camera controls feel a little awkward. My mouse hitting the edges of the screen (both when invisible and visible) didn't really help with that either (even in 1.1..? perhaps it has to do with me alt-tabbing often or something).
I also found that waiting for Youmu's cooldown was a little annoying, I feel like it could've been a little shorter.
Other than that, I really like the simple yet effective look of the game. I'm normally not fond of these levels of bloom, but they work here, and the little details on the terrain look nice as well. The particle effects are great, and both the Youmu and Yuyuko models look good!