I played it, Pretty neat, but danmaku isn't something that i dig, lots of projectile come so prepacked that you don't have enough to time to deal with the patters, which are also randomized.

I feel like the tanasinn's hands could also drop some items too would make the respawning of said items be a lot more easier to handle.

Finally you could have made it so the health bar says it's currently immune first and you have to wait for it, would help to know that tanasinn can be damaged.

Overall i think it's a start, a rough start but still one start, it would be cool to see w2ch modpack tho.