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Helicopter shooter where you also claim territory by building walls. Half Diep, half Paper.io. 2017.
Defly.io is a free top-down shooters io game (territory, upgrade-tree, teams). Tanks, planes, ships and flails seen from above. Most of them owe something to Diep.io's upgrade tree. It ran when last checked, on 2026-09-16.
The game loads from defly.io in a frame. Its own terms, privacy policy, ads and accounts apply inside it, and a save made here is separate from one on defly.io. If you already have progress there, open the game on its own site. How the frames work.