Congrats on the first jam project!
As a fan of the low poly environmental art style myself, I loved looking at the environment of your game as I went through it. I think you did a good job of keeping to the theme with what appeared to be either a looping path or progressive generation of new paths as you went.
I did notice that I wasn't able to collect some of the coins on the far right side. I think they might've been just a little too far out of the player's reach. Also, if you ever opt to revisit this project, I think it would be cool to see a trip or stumble animation of some kind when the player collides with obstacles they can possibly fall over.
Good work! I hope you participate in more jams in the future! :D