How hard should a one-tap arcade game feel?

Hey everyone! 👋

Three Cars is launching here on May 9.

It’s a tiny one-tap reflex game where you control three cars at once — collect circles, dodge squares, and grab triangles to clear a lane.

I’m trying to make it feel instantly understandable, but still hard enough to trigger the “one more try” loop.

Curious to hear from arcade/mobile game fans:

What makes a simple reflex game feel fair instead of frustrating?