When we get to the "full 3D" part of the game it’s impossible to rotate 360°, looks like rotation stops when the (hidden) mouse pointer reaches the border of the screen.

Also after pressing ESC to show the menu, the mouse pointer is still hidden!

On Linux.

Yes, it still happens after restarting the game.
I’m using the LXQt destop environment (with the openbox window manager, and xorg) if that matters.
I’ll be able to try under KDE on my laptop in the coming days.

The camera bug still exists.

One workaround is to set the game as windowed and then circle around the game window with the cursor to continue the movement from the other side.

It might not be comfortable but you should be able to play through the game.

As for me, between this and the inability to remap keys (WASD with an azerty keyboard is just just not fun), I'll put this game on my backlog and wait until one of the two problems is fixed.