About the mod:
There is no gravity. That is about it.

Installation:
This is a BepInEx mod. If you don't know how to set up BepInEx,
you should go to YouTube and look up "how to install BepInEx mods for
a Difficult Game About Climbing"

If you don't feel like watching a video, I will try to explain the steps:

-Google BepInEx and download the latest 5.something version with x64. Example: BepInEx_x64_5.4.22.0.zip
-Go to Steam
-Right click A Difficult Game About Climbing
-Click Manage
-Click Browse Local Files. You are now in the game directory.
-Unzip the BepInEx file you downloaded and drag all 4 of its contents into the game directory.
-launch the game once
-now take the dll file for this mod (e.g. LongArmsMod.dll) and drag it into: game directory\BepInEx\plugins
-launch your game.

If this did not work, please look up a YouTube video.