I submitted a game for GMTK Game Jam in which I you use "only one button". I managed to get into the top 100 games with it (it was ranked 38 overall).

https://itch.io/jam/gmtk-2019/rate/463337

Can I update this game with more things (such as portals, guns, police, including a second and different level generator...whatever that I can program before the deadline)??