Recommend a game between $1 and $15

The Game of Life

Do not buy indie games. At some point in the future they will all be bundled.

Get AAA when it's discounted.

WarZ

Ravaged! It's cheaper on their website.

(any Valve Game), Don't Starve, Terraria, Super Meat Boy, Bastion, Mark of the Ninja, Gunpoint, The Binding of Isaac, Torchlight II

Penny Arcade 4, just finished it and totally loved it.

Dungeons of Dredmor. A near infinite amount of fun for a very low price.

Legend of Grimrock. Not the lengthiest game in the world, but it is a really good one, and on top of that, there are user-made dungeons for it as well!

System shock 2. CRPG meets Shooter, and it is better than Deus ex! Incredibly atmospheric.

IL-2 Sturmovik (if you have a joystick). Still one of, if not the best WW2 flight sim on the market.

Europa Universalis: Rome. Not Paradox's absolutely best game, mainly as it does not have the same amount of replay value, but you can get the complete game+expansion for $10. It will give you far more than $10 worth of entertainment.

What about Don't starve

Call of Juarez: Gunslinger, best western-themed fps since RDR

Din's Curse + DLC - not so good graphic but the game itself is cool

The Witcher, Super Meat Boy

Saints Row 2 if you can handle a pretty bad port, it will give you 50+ hours of content, more then any other open world city type game.

Just make sure to get the unofficial patches and Gentlemen of the row mod.

binding of isaac.

Capsized.

excellent platformer. with excellent atmospheric music. i cant say enough good things about it.

Fez, Hotline Miami or FTL.

Heroes of Might and Magic III, Baldur's Gate II, or Planescape Torment. All from Gog. :3

I mentioned Awesomenauts, and its on sale here

FTL, Bastion, Terraria, E.Y.E. Divine Cybermancy.

Although this is a really broad question. Do you mean games between $1-15 when priced regularly, or does that include when items are/have been on sale? Cause that really opens it up, there are a lot of games worth getting, depending on what kind of games you like.

Command & Conquer™ The Ultimate Collection (Origin) - 14.99€(~19-20$)
Must have imo.

Fourticks

VVVVVV

Monaco.

Magic the gathering 2014: Duels of the plane Walkers. $9.99. Now on pre-order.

WarZ ALOT of copies and post them here

FTL