Managed to beat Orobas and got the completion screen even though I haven't beaten the Sarcophagus, playing on Intended. The 3rd and 4th phase in particular... it's a pattern that's pretty familiar but still gives a lot of trouble. I'm not as experienced with danmaku as other but would agree that the player or bullet hitboxes seem a bit big, maybe I'm just too used to/spoiled by other games but I had some moments where I felt I could have grazed by and ended up taking a hit. I didn't know the focus mode concentrated your fire at first, but it didn't seem like too big of a difference.
Beyond that, I like it a lot. Never had issues with the z axis which is typically a problem in games like this. Dialogue was cute and quirky without resorting to "my fellow gamers" antics, and I enjoyed the obscure references (that I actually knew). The NPCs are really endearing and I hope they won't be forgotten as you progress further. The melancholy music seemed like an odd choice at first but after exploring the setting a bit more it all fits together. Didn't encounter any bugs, even though I went out of my way to mess with things to see if anything went wrong. Oh, and the bloodmurder color scheme could use a bit more contract for the highlighted option.