Technical Features

Fast, pixel-perfect collision detection between all weapons and objects
DirectDraw graphics system capable of MMX software alpha blending (with alpha channel) in both 16bit (555 or 565) and 32bit (888) colour
Multi-threaded engine takes advantage of multiple processors and/or hyper-threading
Smooth replay recording and playback (with speed controls), with extremely compressed replay files (20 minutes = ~40Kb file)
Dynamic musical styles and transitions based on current game situation via DirectMusic Producer and AudioVBScript
Automated and secure (very cheat-proof) submission of high scores to the online high scores system using HTTP, XML and server-side DLLs for decryption and validation
Full support for DirectInput devices, arbitrary key/button mappings, analog axes and force feedback
Lots of testing and a relentless attention to detail has produced very optimized code that runs well even on low end machines
Individual behaviour (AI) for every ship class
Solid, stable and intuitive GUI: both ingame and in the launcher
Smooth animation and impressive graphics rendered from 3d Studio Max models
Generic particle systems (both pixel-based and bitmapped) produce many effects, from shields absorbing hits, to missile trails, to massive expanding shock waves