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This one isn't an arena — it's the sky above it.
Cloudworks — Pixel Cloud & Parallax Toolkit + Trains — a procedural pixel-sky engine: seeded clouds, parallax horizons, and a train on the trestle, crossing the whole scene. Export the whole scene and drop it behind your game.
$6.99 CAD on itch: https://garebearproductionz.itch.io/cloudworks-pixel-cloud-parallax-toolkit-trains
Made by TizWildin Entertainment — Gary, Williams Lake, BC.