I'm afraid locking features of a flash game behind payments is more than I am willing to accept. You already make money through advertisements and donations for this massive game, please do not extort more from us by insisting on transactions as well.
Not only is there purchase-only content, but it's purchase-only content that you can't buy or use from this site. I am afraid that this directly affects my score.
It would be nice that if you were to launch a game on a site that has over 20,000 people on at any given time that at least for a while, you'd have more than 96 player slots in total.
Cons: It doesn't save between sessions, hogs a lot of resources, and requires me to download another proprietary plug-in.
Pros: Good gameplay, and the changes in gravity are not disorienting. A very well-done implementation of the concept.
Decent game. The possibility of an endless grind of training allows you to keep up with your enemies, but is rather dull and slow. Also, I'm not particularly fond of actual audio reading the majority of the text to you. It's much nicer most of the time to just imagine the voices yourself. I wish that all the equipment you could purchase was available right at the beginning, but I can't say I'm actively disliking the game.
The game had no tutorial, but I quickly picked up the basics, and always felt satisfied when I found a trick to advance myself through the levels. There is enough content here to keep a person entertained for ages.