75% off Sine Mora ($2.49)

Retailer: Gamefly

Platforms: PC

Link: http://bit.ly/Z3ltc6 

If the last time you played a shoot-em-up ala Gradius was when Gradius was actually popular, you owe it to the genre to skip your morning coffee and use the savings to grab Sine Mora. In addition to being a really challenging SHMUP, the game is gorgeous.