I already got GameMaker: Studio Steam Version, i believe i already understood how GameMaker made it their, if you guys didn't noticed yet, the gamemaker studio on steam is special version that integrated very well with steam, and also have special export to steam workshop, i believe every softwares on steam already have direct or indirect integration with steam features.
construct 2 deserve to be their as long as integrated somehow with steam features and have direct export to workshop, with new awesomium release recently, i see it promising to be their hopefully soon.