How to exactly edit Cuphead's code?

[TheGabenZone]

Ive heard to use ilSpy, but cant figure out how to edit it's code or even inject it into the game. My objective is to do some tests with projectiles and other stuff, but havent quite figured out how to do it.

Help is appreciated!

[Nervatel]

Its always best to start out trying to understand the language the game was written in, so that you can get context for what each line does.
I use ILspy to decompile the game, but editing it requires either saving the code and recompiling it yourself (this requires you to fix some broken code caused by decompiling it) or using separate software (like DNspy), to edit specific lines as well, though this can also require having to edit bits of code in order for it to work properly.