Im not sure if you'd like to try this, i've tried it before but some things are slightly hard on it.
It's free to play and download. You'll roughly have same benifits of the people who pay. The people who pay can buy extra items (You'll be able to buy them with Marbles (Game Currency)) and faster way of getting it. They can also buy armour and such but the best free armour isn't too far of the best paid armour.
The game is Luminary (Also known as GoonZu). Im not sure if you've tried it but you can play it; Visit
http://ijji.com/ . And register for an account. Once registered you'll also be able to play a whole lot of games (Which are pretty great). But you want Luminary, so visit
http://luminary.ijji.com/ and click "Direct Download File" below "Play Live". The download is about 618.0MB.
Once downloaded and installed click "Play Live". If your planning on clicking "Play Live" with FireFox you'll need a plug in which can be downloaded from the main ijji site.
http://ijji.com/ . It's on the right hand side of the page below your "Avatar".
Once downloaded, you can now click "Play Live" under FireFox.
I'd say it's better to launch off FireFox because if you do it under Internet Explorer (IE) it'll pop up a message saying "This is the first time you're here. Please download the ..... " I can't remeber all of it but it's something like that. You'll have to install that to run your game. But under FireFox you won't need to.