Custom Maps for not Supported Games

[SoFlakey]

There is a new steam game called Lab Rags its really fun but there isn't much to it. I was wondering if there is, or someone could make, a guide to creating custom maps for a game like this this. I speedrun the game and would love to have custom leaderboards on speedrun.com for custom maps like "Flakey's Campaign" which would be own set of levels for speedrunning.