Nice idea.
First I'd like to suggest any type of menu to start and end the game. You will need it later anyways. In that menu you can also have some options for players to change the control for ... flapping(?) ... to another key. For example I'd like to use the space bar to relieve stress of my hand I am using my mouse with. At least have a hint what to do after starting the game. :)
Next would be interaction feedback. One guy mentioned a sound effect. It makes the button more fun to press. You can see this guys video for some ideas:
Well, keep it up! Depending on what and how much work you put in, that can turn out well.