No Money, No Problem: Impulse

Title: Impulse
Developer: Deck16
Platforms: PC
Free
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Don't be fooled by its simple graphics. Impulse is a challenging game with fantastic level design and tons of content.

The developers describe Impulse as "Super Meat Boy and Lunar Lander" and that's probably the best summary I could think of. The controls are simple: left mouse button to thrust in one direction, right mouse button to thrust in the opposite direction, but combine those controls with the myriad obstacles and levels and "simple" goes right out the window. From lasers to homing missiles to dozens of mines that must be carefully threaded between, controlling your thrust and altitude is paramount. One hit kills but restarts are infinite and instant.

Impulse's standout is its level design. Each one is challenging and unique and some are even homages to retro classic such as Pac-Man. A level editor allows players to make their own. You can download Impulse here.