It's an interesting concept that I think could be pretty good with some work. My problem with the game is that its confusing what the goal is. I assume its to get as far as possible but when you can just hold w and press space intermittently to keep yourself in the air and not get hit by anything then you can just go an infinite distance. May want to consider make it harder the further you travel because I didn't notice a difficulty spike that would ever make my game end. Then if these issues that make the game easy were fixed I think things falling from the sky would be unfair since you can't see them coming very well. There would be a couple ways to fix that as well. One of them would be to have the rocks coming from the ground. That way you can have an indicator show where its going to spawn so even if it spawns underneath you, you would still be aware of it in advance and it wouldn't seem like the rocks are popping out of no where.
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Thanks for the feedback and ideas! I ending up spending most of my time implementing the basic mechanics and so actually shaping those mechanics into a steadily progressing and rewarding challenge fell by the wayside. I originally wanted the rocks to roll down the hill, which would give you some warning, but getting the physics right for that seemed impractical for the time.