Hello! Thank you for your feedback!
1. Lot's of these effect like Chromatic aberration and noise filter are gone and won't be in the next update. Vignette is staying but will likely have an option to be disabled in the future.
2. I agree it's quite jarring and will likely be gone in the future. The reason why it's happening is it's tied to some of the systems that make sure you can't move and are immortal etc.
3. Levers are pretty obvious I agree but there might be some more vague things like the drawing on the wall that you can interact with in the demo. I think it's fine as it is for now.
The grammar errors will be fixed towards the end of development as I will have people which's first language is english check it. Effect and all that will also be changing throughout the development .
Thanks again for trying out the demo!