Sorry, I did not even say "hello" while filling in the bug report.
I launched another run right after, without restarting the game, and the bug did not re-occur.
Somehow I could not upload more files, but will do if needed.
On a side note, I just achieved my first finished run, this game is awesome, thank you :)
Playing solo with a team of 3, second floor, after openning a door, there is a blackout.
Every character, but also every monster are locked in place, no way to move, the floor is completely locked, since it's in a blackout, there is no way to check if the team can teleport back to the crystal bot either.
Nothing seems to be able to remove the lock, can only abandon and got back to the Saloon (no way to save during a wave).