There is something in the world of marketing called the USP - the Unique Selling Point. Remember those initials because you'll be needing them later.
There is nothing at all unique about the game idea of Delta Wing it's a 'war in the air... blah, blah, blah... jet fighter to defend the bases... blah, blah, blah... land to refuel... bomb their bases... blah,... blah. In short, an everyday tale of shoot 'em up flight simulators.
As to the graphics, well they look more like paper darts than MiG fighters, with their wire-frame 3D effect, and if the bases are marked as diamonds on the map that's because it's all they are on the ground.
If you can forgive it this multiplicity of failings and treat it as an arcade game it plays reasonably well, though I was fascinated to find how easy it is to actually ram another speeding jet!
Now we return to the USP and this game has one. Boy, does it have one! If you can find a Spectrum-owning friend and you both have Interface I and separate TVs, then you can indulge in true one to one combat with each of you getting your own cockpit view.
It's a novel touch and one that I'm sorry to say I was unable to test because... I've not got a friend! If you're more privileged than me in this respect it's probably worth the three pounds for a unique experience.
Joysticks: Sinclair,Kempston, Fuller. AGF/Protek