Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics
SalesBundles
Jobs
Tags

it’s not super straightforward but each level is stored in a JSON file so if you were to go into the game’s “data” folder where the levels are stored you could add the line

"grav" : (your gravity here),

and it would change the gravity. Default gravity is 0.2 so 0.1 would be half gravity, the rest is pretty self-explanatory