Works surprisingly well with no configurations needed. Game defaults to "Keyboard (WASD) and Mouse" which mostly works fine if you're willing to use Trackpads + Triggers to move mouse and click. Or use Joysticks + Triggers with less speed. Tile selection could potentially work better if somebody was willing to make a configuration making the mouse jump to various positions.

Steam Decks inconfigurable touchscreen doesn't work well with Numba despite it looking like a game built for touchscreen phones.

Game is a Match three and if your cursor exits a chain of selected tiles, the game will count that as an activation/confirmation and grant you the points for that chain, meaning it be can easy to accidentally "score too early" when trying to make a long chain. You will have to get used to selecting a chain of tiles, holding the right trigger while letting go of the trackpad so you can reposition your finger to reselect the remainder of a chain - Once you start selecting a scorable chain, you only have so much space to work with on the trackpads.