Here's my Weekend Picks.
Because SHMUPs are awesome. Great for burning an hour or two if you're bored.
The Irregular Game of Life
This game is a set of puzzles based on the game of Life. And no, the answer to each of the puzzles isn't 42.
Modern Tactics 3
Definitely one of the most underrated games on Kongregate. It's a turn-based strategy game, where every turn you make your units move and attack. The learning curve isn't bad at all, but the game can be challenging.