This epic 2D browser ARPG is no longer just a browser game, it now has Steam client and can be played with other Steam users. It even has awesome Euro Trash-ey music playing in the background and a ridiculous amount of enemies, turning this into a bullet-hell hybrid that's quite unique in this oversaturated ARPG genre.
The only other game I can think of that had a similarly crazy gameplay, it would be The Realm of Mad God and even that game wasn't as fast paced in comparison.
For a free to play MMORPG with a light undertone, easy gameplay, but that is quite challenging to master, I think there are few other games you could pick instead. Check it out on Steam and watch the video below.