Hello!
Me and my friend played this and we believe we were softlocked. During the boss battle against Muriel, when the tileset turned to black and she was doing her instant kill teleportation stuff, I think we died outside the borders of the black tileset (a gate was broken and we were inside the area that was blocked off by the gate) and we weren't able to respawn.
Here's a photo of the gate that was broken, subsequently we entered through it and died outside of what I presume to be the only area where we could respawn. I took this photo from the trailer that you have and highlighted the gate that was broken. We weren't able to screenshot our own game in time.
Other than that though, the puzzles before that area were pretty fun.
Me and my friend played this and we believe we were softlocked. During the boss battle against Muriel, when the tileset turned to black and she was doing her instant kill teleportation stuff, I think we died outside the borders of the black tileset (a gate was broken and we were inside the area that was blocked off by the gate) and we weren't able to respawn.
Here's a photo of the gate that was broken, subsequently we entered through it and died outside of what I presume to be the only area where we could respawn. I took this photo from the trailer that you have and highlighted the gate that was broken. We weren't able to screenshot our own game in time.

Other than that though, the puzzles before that area were pretty fun.