I made a video talking about a free fly camera cheat table for Cheat Engine
I highly recommend you to run the game in Offline Mod or unplug the modem, better be safe than sorry.
The mod is quite basic, you have free camera movement based on player position rather than player camera postiion, and its not smooth. BUT it is a great tool for screenshots and exploring the map.
The free camera can only roam where the level has rendered around the player.
Direct Download via Google Drive, if you are familiar with Cheat Engine: