Nice execution of minimalism! The chunky lines are pretty to look at and feel solid to navigate. Also, kudos for implementing gravity changes in a way that feels intuitive without the need for explanation!
If you decide to develop the game further, I only have a couple suggestions:
First being to make the rock/paper/scissors aspect to colors more memorable because it took some trial and error for me to figure out that each color overwrites only one other. Maybe different shapes or symbols would make this clearer? However, the fact that I could figure it out speaks to your solid level design, so take my critique with a grain of salt!
Second thingy is that falling isn't really explained. Admittedly, it's very likely a player will fall off the underside of some platform at some point, but there is no stated cause for why that might happen, only an internal timer.
Anyway I liked playing your game! Thanks for sharing it!