Hey, a pretty cool start for a game, there's so much things that can be added, it just rustles my imagination, it's a bit of a shell of a game for now, but I think there's some cool things that could be added to make it pop:
• recipients of the pizza disappearing after delivery,
• an arrow pointing you to where you should deliver the pizza,
• better bike physics - like in making it not turn on a dime, but require forward momentum to turn (this is also a very good programming practice btw),
• some hazards, like people walking around and maybe cars to avoid, so the gameplay isn't the same all the time
And much more! That being said, a very cool start, keep making them games, you are clearly doing well!