Requesting web browser games.

http://www.andkon.com/arcade/
everything on here is pretty good

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http://www.nitrome.com
Nitrome makes a lot of fun games with beautiful pixel art. All of their games are really good.

www.kongregate.com
Been playing shit in there sinces years ago
There's also Newgrounds if you're looking for a "diferent" kind of game, if you know what I mean

http://www.mausland.de/
I've enjoyed these games since I had internet
These are mostly short and packed, there are games for little kids, teens, and some with naked women (both human and anime)
This guy also made the Shark game, and has some games for mobile too (just games, no micro transactions of any kind).

Frog Fractions

http://agar.io/

very simple yet addicting