Copter.io

Copter.io is a helicopter game similar to Defly.io and Diep.io. It was developed by Exodragon Games in 2019 and has not received any updates since December 2019.

Gameplay
Players must shoot at crates, drones, tanks, and other copters to gain score and upgrade various stats. Every fifteen levels the copter can be upgraded, either to obtain a new skill or upgrade the copter. There are many different copters to choose from.