I'll try to do a short review because I usually type much about the games I love.
Easily one of the greatest flash games of all time.
The art style is unique, the levels are interesting, some of them require a different strategy, lots of characters (with some being from other amazing franchises), lots of weapons, lots of achievements and last but not least, lots of fun. A great fighting game and a very good nostalgia factor. If I could I would give this 10 stars. It completed my childhood and thanks to Newgrounds Player, it might complete someone else's childhood in the near future.
Thank You EON for your work. Chaos Faction and Chaos Faction 2 are legendary.
And hey, if you're up for another sequel, we're all STILL waiting for a Chaos Faction 3, haha.