What separates good touchscreen controls from bad ones

You rarely notice good touchscreen controls, and that's exactly the point. When a game feels right under your thumb, you stop thinking about the screen and just play. When it's bad, you think about nothing else.

The best mobile games design around the touchscreen instead of forcing console habits onto it. One-thumb schemes, generous hit areas, and optional control styles all signal a team that tested on real hands.

Neon Drift Circuit is a good study here. Its on-screen controls are tight and its tilt option is there if you want it, so nobody's forced into a scheme they hate. That flexibility is a mark of care.

My rule of thumb: if I'm fighting the controls in the first five minutes, the game rarely recovers. Great mechanics can't survive inputs that get in their way.