this game is excellent as well as all others games by
Matthias 'StarFox' Boecker.
In fact all his games was released in full version as freeware on his site but... his site was closed...
but
GOOD NEWS, today i've see on
AmigaImpact that his site is back !!
Starfox's homegape :
http://www.lazycow.de/index.html