1. Download cheat engine https://www.cheatengine.org/
2. Download the file 1.0_1.1_FinchGame.7z at this link http://www.wsgf.org/phpBB3/viewtopic.php?p=170381#p170381
3. Unzip it with 7zip or WINrar
4. Save FinchGame 1.1 to somewhere convenient
5. Start the game
6. Alt-tab
7. Open FinchGame 1.1
8. click File then Open Process
9. Select FinchGame.exe and press Open
10. Click Yes
11. Right click on v.1.1_FOV -> Change values -> Address


12. Type a number then press enter

The default FOV value is 0.008726646192. It seems to me like the three digits after 0.0 are roughly equivalent to the degrees of horizontal FOV. For example:
0.0090 = 90°
0.0120 = 120°
If the fov doesnt seem right, mess around with it a bit

Note: After you put in the fov, it will round it to a number with the same number of digits as the default. This is normal.

13. Go back to the game

Note: You need to do this every time you play the game

Also, this will make the menu look smaller, and makes one particular moment when the screen is supposed to go black not actually cover the whole screen. The rest of the game looks completely fine though.