Can't recall the name of this shmup~

[Avalon]

I watched this cool video of a horizontal shmup and I can't frikkin remember what it's called... But I do remember a few specifics about it.

It had backgrounds that sorta reminded me of R-Type or Heaven Variant - slow moving scenes that would scroll every which way as if you were flying through a city, even though your ship always faced forward. Enemies (especially bosses) would come at you in stages; First from the front, then later in the level suddenly appearing behind you. Each boss was given a name you would see when the boss was first seen in the level.

Late into the game there was a boss called... DOMUS, I think? Big huge round thing with a maze-like interior you had to work your way around to get to the center and blow it up. The big reason I remember this was the boss's "title screen" - I had to rewind the video to see it again. Did they just describe that thing as a SSOB PU DEKCUF? Yeah, they did. "FUCKED UP BOSS" spelled backward. Very descriptive!

[cfx]

.

[Gespenst]

Big huge round thing with a maze-like interior you had to work your way around to get to the center and blow it up.

So, this perhaps?
https://youtu.be/Spdee9BW7qs?t=6m44s

[Avalon]

...Oh look, it's the SSOB PU DEKCUF I was talking about!

So... Sine Mora. Thank you!