All of the following criteria must be met

• All Requirements must be installed.
• Full Latest.log file included. If no file exists then leave this unchecked and state so.

All of the following are optional to answer

• Tried reinstalling the Game.
• Tried reinstalling MelonLoader.
• Tried restarting PC.
• Was able to see the Start Screen.

Describe the issue.

Latest.log

I'm using dnSpy version 6.1.8 (x64), when I try to debug the game, following the steps in the wiki, it fails:

unable to connect to the debugged process [...] make sure you have patched the mono.dll file of the game

Unity: 5.5.3f1
net35

Did you attach your log file?

• Yes, I attached my log file to the text box above.
• No, I could not find a log file at {Game_Directory}\MelonLoader\Latest.log

well, did you get the patched mono? https://github.com/dnSpy/dnSpy/wiki/Debugging-Unity-Games

I'm using this but no luck
https://github.com/wh0am15533/Patched-Unity-Mono/blob/main/CustomBuilds/Unity-debugging-5.x/unity-5.5.3.rar

Allright I had to compile mono.dll from the official repo, but now it works!