Press the green flag, Arrow keys to move (I'm not fond of WASD), Press buttons to go to shops, Press people to talk to them, Press items to buy them (just so you know, the ball, your first item, is free).
NOTE THAT THIS IS A WORK IN PROGRESS I'm sorry that I have a lot of work in progress projects right now but I'm just held up. @GalaxyAnimeCat for giving me the idea from her Sketch Stand.