The marching formation, the crumbling barriers, the UFO streaking across the top for bonus points — the full Invaders loop, with an actual win state when the last alien falls.
Co-op is the real draw: two cannons on screen with independent lives and scores, defending the same barriers against the same descending wave. Fifteen achievements, chaos modes included.
Built on Insiculous 2D. Playable right here in the browser (WebGPU —
Chrome/Edge, or Firefox with dom.webgpu.enabled); desktop builds
(Vulkan / Metal / DX12) run the same code natively.