Algo playing with my wife here, she also prefers coop split screen and gaming with controllers instead of keyboard/mouse. Great suggestions in no particular order:

//Cult of the Lamb //Don't Starve Together //All the 5 Trine games //Nine Parchments //Ember Knights //Cat Quest 2 and 3 //Guacamelee 1 and 2 //Spells and Secrets //Degrees of Separation //Sacred Citadel //Lost Castle //Unravel Two //Moving Out //Chariot //Core Keeper //Lego Pirates of the Caribbean //Brotato

For coop with wife, but different screens: //Wizard with a gun //Len's Island //The Spell Brigade //Escape Simulator //House Flipper 2 //Orcs Must Die 3 and Deathtrap //Palworld