Pebble Path

You control two dots tethered together at a fixed width, sliding down (or scrolling toward you) a vertical playfield. Obstacle pairs stream in from the top, each with a corridor gap you must steer your pair through by dragging horizontally — miss the gap and it's game over (unless a shield power-up absorbs the hit). As your score rises, a shared difficulty curve smoothly ramps up scroll speed, narrows the safe corridor, and thickens obstacle density, so runs get harder gradually rather than in sudden spikes, with the ramp easing off (but never fully flattening) past a high score threshold for very long runs.

Along the way you collect:

Coins, the game's currency, plus a combo multiplier that builds the longer you survive/collect without a hit.
Power-ups: Shield (absorbs one collision), Magnet (pulls in nearby coins), Slow-mo (slows the world down), and Double (score/coin multiplier) — each stacks duration up to a cap, except Shield which stacks as extra charges.
Outside the run itself, PebblePath has a full meta-game layer: a home hub with profile/avatar, level and XP progression, a shop and currency system, daily bonus rewards, achievements, a pause/game-over flow, and onboarding. It's backed by Firebase (auth, Firestore, analytics) for player profiles and persistence, and features global/country/city leaderboards — the country/city scope is powered by an opt-in, permission-gated GPS + reverse-geocode lookup (never automatic, never faked). Sound effects, haptic feedback, and share/screenshot support round out the experience.