Finished the demo, was kinda enjoyable.
* There doesn't seem to be a main menu.
* Had to discover controls: F is interact, I is inventory, Shift seems running, S/D control that device with the key, Q then R for the revolver and E removes its used casing.
* I thought the mouse sensivity was enough but still sticked with it.
* When I entered the second room with the doors, there was a bit of a short freeze but I still kept through.
* At some point, I dropped the charred key from the inventory and couldn't pick it up again, so I restared the game.