Yes, the “game” really needs a little more info. WASD (or arrows) + E (grab) + R (rotate) for others who struggle with the keyboard. And you need the fruit before you can carry stuff!
Anyway, I don’t understand your suggestion. Mouse as touch is enabled, so you can click on the controller buttons to control the character. But this is quite tedious. Further touch control is not available, even with touch screen. A touch screen would also not be retro like ;-)