Surprisingly, after searching quite a bit (and I mean QUITE A BIT!!) I did not see one thread about this game.
I myself found it pretty fun and addicting, so I guess I'll just shut up and get on with it.


Gameplay:
Props to SDA for being cool peoples.

TAG is a first person perspective game where the object of the game is to, who would have guessed, get to the end of a level.

However, due to your limited agility (you can't even jump), getting to the end of anything but the tutorial level is kind of impossible.

But! Thanks to the somehow magical power of of your trusty paint gun, you can right click to erase, or left click to use an assortment of Green (Jump) Red (Speed) and Blue (Stick) paint to help you traverse through the rather bland colorless city.

It also has some pretty bitchin' music as well.


Development:
And if this sounds in even the slightest way familiar to another game *cough*portal2*cough*. Then that's simply because it is!
The same developers of this game, way back in 2009, were brought in to work on the repulsion gel for the second half of Portal 2. So that's a nice thing to know when playing as well.

How to get it:
Lastly, it is Freeware and can be found online via multiple download links. However, I do warn you all to be careful because of this. Skolfe out~

Also, for any additional information. Wikipedia is your closest friend.