It seemed to me like the version was 2.49, which was a pain in the a**.
Same here, you can throw a "game" together in GameMaker/Unity in few hours but it is just not the same when you solved collision detection/solving after days of strugging
Also the possibilities are endless if you build it from scratch.
Since there is no support for XNA, what will come next? I don't know XNA, was a little turned off when I saw you can only develop for Microsoft devices...
Good luck with it! There is a little to no ressource out there. But if you know the basics in Java, you should be fine with the API and some stackoverflow discussions. (also there is a subreddit, but people are not very active, I still hava an open question for 2 weeks now concerning multi threading)