I've been seeing a trend going round on Youtube recently of Indie Devs making a game in 1 hour vs 1 day and I wanted to throw my hat in the ring and give it a go myself! I decided to go with a recreation of a game I made as a teenager, Mutant Plant From Mars. It was a super simple game involving a mutant plant moving left and right on a screen to collect rain drops and grow tall enough to reach Mars from Earth. The player also had to avoid asteroids that would bump the plant back down a notch. Finally, all of this had to be achieved within a certain time limit.
I made a Youtube Video of the experience so check it out if that sounds interesting to you!