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The Steam Deck is a PC and this is a PC game, so you don't need to explicitly support it

steamdeck runs linux

Steamdeck ships with Linux. You can install Windows if you'd like.

Clearly the question is "will this run on steamdeck with the default configuration, i.e. Linux?"

This is built with haxe / hashlink / heaps, which work perfectly fine on linux so there should be no problem getting it to steam deck.