Great concept, and nice visuals to go with it! I can definitely see the potential for this project.
A few notes I have:
1. Like others have said, when you're in the air, you can just hold sprint and right, and you will never lose, because you're just floating to the right forever. So it is definitely a game-breaking issue.
2. It seems you can also jump infinitely, so there's no strategy for when to time your jumps and avoid obstacles.
3. There really isn't a downside to running into a skull, because it doesn't slow you down much, and you can just jump over it still and get past it easily. So to me, the game is nearly impossible to lose.
4. The dust is very slow, so there's really no sense of urgency or intensity to run away from it, like the theme suggests there would be.
I think overall this is a really cool idea, and for a gamejam, it's absolutely well executed! I would however love to see some polish updates and improved gameplay :)
Nice work!
-D