the drag and drop card ui is so intuitive!! it needed no explanation, i think it was a great way to let players interact with the world. exploring what i could use my cards on was fun, i got every ending after not too long! the particles are also good feedback for how the world is reacting to your input, like the stick being wet for example. if you want players to get every ending, maybe you could introduce a "speed" card or something, to make the player walk faster so you dont need to wait?
the system of cards being dragged onto objects in the world just seems easily extendable if done well, i think its a great idea!