I got myself a copy of Game Maker: Mac and start to mess around it on my roommate's MacBook.
First I revived my broken old Highway Trouble file and built a Mac edition of it. If you're using a Mac, why not download and try it out? Then I planned and built a sequel of Highway Trouble as well, though I made an Android version of it.
Anyways, I will update a little more here once I got some interesting progress.