Intergalactic Prophylactic

Intergalactic Prophylactic (or InterPro for short) is a demo of a quickly constructed homage to one of the most impressive early arcade games - the 1981 "Defender" by Williams. I've tried to make the gameplay pretty faithful to the original (whilst also taking a few cues from the excellent BBC Micro clone, "Planetoid"); but I've also tried to put my own silly spin on some of the graphics.