If your monitor doesnt support that mode that sounds more like your video card display than the game.
Did you modify the resolution but didnt check the Hz that your monitor doesnt support? there is 60 Hz and 50Hz
Try uninstalling the game in the library rightclick

I did switch the Hz, didn't think much of it, but the monitor just noped out. I already uninstalled and then reinstalled and the setting didn't reset.

See this
How to change the graphic without starting the game?
1. run regedit programm (Win+R, type "regedit", Enter)
2. navigate to HKEY_CURRENT_USER/Software/Mindillusion/ForestVillage
3. delete the key "Resolution"
https://psteamcommunity.yuanyoumao.com/app/496460/discussions/1/343785574520124451/
that should cause the game to default.
Please let me know if that fixes it or if you need help using the reg editor
as there is three I have MIB to update it.

I managed to get into the game and change the resolution. I started it up, my monitor said nope, but then I bashed some buttons on my keyboard and it displayed my screen again with the game minimized. I right clicked on it and used the a Windows option to force it to run in a lower resolution, and then I was able to properly get in and change the settings.

Now I just have to find out if I can squeeze more fps out of the game or if I should shelve the game until I get the money to buy a new computer....

Well done glad you got it back. Started in VGA mode good idea.
thanks for the update nice to know the results.
You cant push the games FPS faster if your system cant handle it.
Playing at x2 is the recomended speed and only use x5 or x 10 for short periods.
Lower the quality of the water reflections. No loss really.
Delete auto save / manuals saves up to the current have like 2. Do this everytime you load the game then you can see the amounts saves .
My specs
Intel i5 3.4 GHz 4 cores. first time I ever built with an Intel have always used AMD as it's faster but gets hotter. Not impressed with Intel. Refresher rates is not as good AMD.
Windows 7 x64 pro restored from windows 10. Hate windows 10 too sloppy slow missing too much stuff. Had windows 7 but it auto upgraded to windows10 lost all use of my multimedia tools useless windows 10.
Windows 7 will be around till 2020 and this system wont last that long anyways.
8 gig of DDR 3 ram
500 gig Western Digital HDD wont use SSD drives for games.
I use 3 - 5 terrabyte WD and Seagate expansion USB drives to backup / copy to all my files and have only few things on my system drive. This way if it crashes nothing lost.
Steam stores all our game regardless so we can just re-install with new systems.
My power Supply Unit is Antec 850w the PSU is the heart of the speed of your system. No PSU should push power usage over 66%.total load.
Video card Nvidea Gigabyte 860 OC with 3 gig of ram'
My system is 4 years old and works really well.
LIF plays fine no problems and with all the fixes gets better and better
Update drivers for your GPU from the manufacturer.
Oh and I play in window mode full screen
Hope this helps

So I myself screwed my game up, not playable and it was not due to a bad update or anything wrong with this awesome game... yeah I got a big ass new monitor, I have fought to make my game load for a week with out bad Input Not ____ and finally came across a posting from 2017 where OtterVonBiscuit had the same problem and Jaunitta had the solution.. although I just when to view my game files and started the game from there instead of thru steam and yes! she was right I changed the 50Hz to 60Hz and chose a different Resolution applied and went back to steam and the game started right up.... Thanks @OtterVonBiscuit and @Jaunitta also thanks to my favorite Modders that make this game so unbelievably fun ! eien - Megadore and there are more I just can't list them all here :)