Apologies, I accidentally made the field that speaks to justifying your use of the limitation private and there's no way to revert it. Please see the justification for the limitation of this game below:
There are many ONLY ONEs that can be picked up on the fly - only one player, only one axis the player moves on, only one thing killing you and only one level. The noteworthy ONLY ONE would be that we had only one meeting for the project but my favorite is that I restricted myself to picking the two background songs from ONLY ONE album (took longer than developing the entire game).