"Gem Raider" is an action/arcade game with a touch of a puzzle element. Turn on all 4 switches in a Sector without being destroyed by mutant gems. Destroy the mutant gems and protect the white diamonds to maximize your score.
The game (the grown up version of "Gem Runner" from the DXGame Programming Contest earlier this year) was written using VB6 and the DXGame 2D engine.
There is a free demo of the game available for download.