My second full game, an invaders clone with a ship upgrading twist (not a very new twist i know).
It features 256 colour hand draw animations and different aliens with different strengths. Sadly over the years since I wrote it I've lost the final complete 200 level version, so all you have here is a cut down 20 level demo version. A shame really.
It lacks sound I'm afraid, if you've every tried to code for the old soundblaster you may well understand.
Invaders runs at 320x200 modeX resolution, also written using the borland pascal compiler, it will also fail to run unless you've got a 386,486 or old Pentium. It does however run very nicely in DOSBox