Barnstorming: fly a plane through barns.

I was lucky enough to grow up on this system and there are some absolute bangers out there:

Mission: Shark (or Misja on the European continent): arguably one of the best games on the systems. Silky smooth animation, great gameplay loop, fantastic music. Janusz Pelc at his best.

Rescue on Fractalus: fantastic foray into faux-3D. You'll never forget the first time you picked up your first "pilot"...

H.E.R.O: finely balanced, a great time killer.

Encounter: far beyond it's years, the precursor to open world games

Fred: another J Pelc masterpiece. Great platformer.

Star Raiders II: beautiful shooter. The space shoot em' ups of today can trace their combat gameplay directly back here.

Lode Runner: one of the best and smoothest implementations of this game, along with...

Chuckie Egg: the original and best.

Zybex: a competent shooter with some of the best chiptunes you'll ever hear.

Blinky's Scary School: bastard hard, but full of British humour.

Fort Apocalypse: fantastic shooter, with stunning graphics and a blue doppelganger helicopter that will give you nightmares.

Rally Speedway: takes the top down racer formula, tightens the controls, makes it prettier, and gives you a level editor too. Brilliant.

River Rescue: River Raid but better, and if you disagree then you're entitled to your wrong opinion.

Have fun!

M.U.L.E. is great

Berzerk and Wizard of Wor are both fantastic fun.

There’s also a homebrew port of Bosconian, which gets my vote for one of the most underrated arcade games of all time.

Joust, Jumpman, Lode Runner, and Prince of Persia were good on at least some 65xx machines of that time.

Super Breakout was my favorite paddle controller game due to the sound randomization, and Imagic's Demon Attack did some groundbreaking graphics on the platform. As far as ports of arcade games, Phoenix was pretty good. Adventure is iconic.

The Zaxxon port is quite good, and I also have fond memories of F-15 Strike Eagle.