Played the demo on steam recently, its very fun and well made, i especially like swapping characters on the fly and HANK THE TANK. This would be on constant rotation on my steam deck if there were an option to aim in the direction the right stick is pointed, just moving a cursor with the stick is slow and awkward imo.
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The game has some controller support, but I think Steam Deck overrides it with its own. I don't know exactly how Steam Deck works, but there should be a way to toggle input to use the built-in controller controls which should work a bit better for aiming. Doesn't entirely work on UI elements like the level select for example though.