lol well just the demo and its free for everyone
I restarted completely without the trainer and it worked instantly. The trainer causes a physics bug but I'm not sure which option. Just a heads up for the final version. You can try for yourself by shooting the brazier. If it doesn't react to bullets it's bugged.
Not sure what is causing it for you. I just got to that bit with the trainer on using options 1,2,4 and 5 on and I had no issue.
It's the Super Damage option that causes the physics to glitch out. You also have to reload the checkpoint with option turned off to be able to progress. Maybe this should be added to the readme in the final version.