To make multi-platform 2D games, GameMaker Studio is definitely not inferior to the well-known and popular Unity which is one-size-fits-all to both 2D & 3D games development. Of course, as for merely 3D game development, AppNee suggests you choose the Unity instead. Because this task is beyond the strength and power of GameMaker Studio. This advice is especially suitable for non-professional and amateur enthusiasts of game development.
GameMaker Studio (GMS for short, formerly called: Game Maker, Animo) is a very powerful and popular cross-platform, multi-genre game development engine (GDE)/game creation system (GCS) for both entry-level novices/amateurs and seasoned game development professionals. It was written in Delphi by Mark Overmars from Netherlands and first published in 1999.