HELI 100 has the standard backstory of an arcade blaster: hordes of aliens are invading; but, for some reason, all your lot can cough up is a single defensive fighter. Into the fray you go, then, your people’s last hope against annihilation.
Fortunately, your craft is pretty hot stuff. You use two thumbs to have it zigzag between enemy fire, and it automatically retaliates, blasting foes to pieces. Now and again, pick-ups helpfully appear, which when triggered unleash all kinds of extremely dangerous death.
There are 100 levels in all, the last of which is endless, and the first ten or so of which are quite dull while you’re learning the ropes. Stick with it, though, because HELI 100 offers some cracking shooty action perfectly tuned for mobile play.