Fireflies

A small game you might play on the morning commute.

Technicals
Fireflies is a minimalist; one-control; tilt-based game.

It was released in 2016 with Swift 2 using some of the first iterations of the SpriteKit framework.
Gameplay
Varying weather systems, day-night cycles, procedurally generated bad guys, five levels, unlockable perks, and unlockable characters means each attempt differs from the last.