Notice I didn't say 'trainer', because that normally implies infinite time / infinite ammo / infinite fuel / infinite lives.
I loved the idea of Armour-Geddon, but the ST version seemed to me to be stupidly hard to play because of a constant severe shortage of... something, possibly fuel for the aircraft. I think the rate of fuel use was so high that you had barely any time in the air, or something like that.
Whatever it was, it made the game annoyingly rock hard and I remember having an ambition to create my own version with the right rate of fuel use, ammo, etc, to make the game pleasantly challenging but not ultra-impossible as it seemed to be 'out of the box'. Of course I never did, and I have now forgotten 98% of my ST coding knowledge.
Did anyone beat me to it?