I recommended this game to a friend who lacks access to a PC at home. He mostly uses a PS4 and an iPad for entertainment.
How hard would it be to add touch controls to the web version, or perhaps controller support?
Also, since you clearly lost interest in developing this project further, have you considered releasing the project files so that new levels could be created? I'm not a GameMaker user (working in pygame and experimenting with Godot), but maybe someone else who else who likes the game might make additions.