Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics

Sure no problem! I think the problem indeed lays in the fact that MacOS can't find a file format or program to execute to start the game. I'll keep you updated if I find the solution. 

Keep me also updated if you find a solution. This could let a lot of games run on MacOS that now seem incompatible, despite having a Mac build.