You can't update that game with butler. What you need to do is start a new channel for your game.
I'm assuming it's "jumpy-boi-platformer-game".
First off you need to install butler, once that is done I'd recommend creating a batch file to push it. Here is what mine looks like:
"butler push --if-changed KnK2-demo arekku/kitsune-no-kenshi-2:win-demo
pause"
You could do this in a command prompt as well, but having a batch file saves you from having to remember it. The pause at the end isn't needed but I want that pause so that I can confirm that everything went smoothly.
Here's what your file would look like
"butler push --if-changed YourFolderGoesHere mrluka-games/jumpy-boi-platformer-game:win
pause"
Edit:
--if-changed is butterfingers protection, it will only push if the game has changed