Why every runner feels the same after level 20
I've played more endless runners than I can count, and there's a moment in almost all of them — usually somewhere past level twenty — where the whole thing collapses into busywork. The obstacles stop being puzzles and start being tests of endurance.
The good ones fight this. Ember Drift does it with its light mechanic, forcing a fresh decision every few seconds. Neon Dash Loop does it by warping the geometry so your muscle memory keeps getting reset. Both give your brain a reason to stay engaged.
The bad ones just crank the speed and hope you don't notice. Faster isn't more interesting, it's just harder. And harder without new ideas is where people uninstall.
My advice when you're trying a new runner: play past level twenty before you decide. That's where you find out whether the designers had a plan or just a treadmill.
If a game still surprises you at level thirty, keep it. That's rarer than it should be.