Oh god, I remember first finding out about this game while it was being made for a competition on TIGsource. It was great fun, and I suppose it still is, but after a while of not playing it and coming back to see so many changes, It has definitely taken a turn for the worst.
The basic premise of the game is pretty much a multiplayer 'bullet hell' style game, most of the action (PvE, but they introduced PvP later) takes place on a randomly generated continent which is really big and possesses many diverse environments. This means that there's not a shortage of bosses and mooks to kill, and temples and castles to raid for loot. The item system is pretty easy to understand, with gear being divided on tiers, a higher tier meaning rarer and more powerful items.
Initially, you are made to choose a class and dropped off in a tutorial with only a basic weapon and a skill item. The game itself is pretty fun, and you can play for hours without it getting boring or repetitive. Here's where the game starts falling apart. Most of the action that happens later is just plain old grinding. Even for the hardest monsters getting item drops is really hard, as the item drop rate is extremely tiny.
The worst thing that's happened to this game was the developers being bought by Kabam. It has pretty much become a pay-to-win affair. Before, you could buy cosmetic items and pets with real money to support the developers. Now you can get the rarest armours and weapons with a few bucks. Like I said before, the item drop rates are ridiculous, so selling weapons and items for real money feels kind of cheap.
All in all, a good game ruined by 'freemium'. If you play it, expect to grind a lot, or pay up.