What advantages would you say Gamestar offers over existing well-known packages such as Game Maker or Construct 2?
Do Gamestar games also run in other, non-Firefox browsers?
Well Gamestar runs in your browser. That is a big bonus in that you can restart it easily. I have a background in psychology and have applied it to make Gamestar "gel" easily with gamer minds. The interface isn't perfect but there is little I can do to improve it with HTML.
It's also free, and will remain so.
Games don't run in other browsers now but in a couple weeks I will release a new version that packages games as HTML pages that run independently of the development system. I would that it worked in other browsers, but only Firefox offers the saving/loading functionality that is so crucial to useability. Webkit's dominance has been a particular problem, elsewise I could have made it run in Opera.
I've no plans to open the source at this time. But I'm not about to give up on it, either. 3D is in the works. The reason I don't want to open source it, is because 1) I don't want exploit versions floating around that I can't kill with a DMCA if it comes to that, and 2) I want to rethink the game making process from the ground up. Gamestar in its current state represents that questioning. Questioning is good and there should be more of it. Fun in particular is lacking in the design process -- game making is a chore -- and I implemented the real-time design feature with that in mind. I want Gamestar to be easy and fun to use and I want it to have a rock solid reputation for the same.