X-Com came from Laser Squad (and I guess Rebelstar?) before that I think? The Gollop brother's earliest one. Great ZX-Spectrum title..
Couldn't resist a memory lane (16k) detour.
I thought these graphics were photo-realistic at the time. Memory is a funny thing.
..I mean, look at the loading screen - it was like being there!
Plus staring at the Cassette in-lay while it took 15 minutes to load didn't help.
I wasn't the only one - check out the review of the time. "The graphics are quite superb.."
You can play here via emulator ( W, X, A , D for cursor keys as they mapped to the Kempston Joystick )