A fun, fast-paced FPS with high replay value. I’ve played a few times now, but could only make to wave 8 at best; I really wanted to see that boss that was mentioned in another comment.
Movement and dashing feels good, and I know it would work great in larger stages with more variety. I agree with Luyuu that it’s too easy to lose your health very quickly, but at least the drops are generous. I have also noticed that the yin-yang enemy can home in on you and end your run too quickly. Finally, I think the last weapon could use some homing, or some other kind of buff. I ended up preferring the machine gun most of the time.
Sound effects are on point. The music is badass and fits the mood. The story art in a 1-bit palette looked great. Needs some tweaks, but overall it’s pretty solid, and it's good to see a Touhou FPS, because they are not very common.