Thank you so much for your review, it was great! I am pleasantly surprised that you think there is more potential to this idea. I might dedicate some time to it!
Yes, the fact that it was game jam game (and I have a normal job, so very limited time) did cause many of the problems, particularly the lack of variety: I had planned also Jumping over gaps (like roof tops) and jumping forward off of hedges and walls, as well as more possible outcomes from Obstacle-Speed combinations. But I made a horrible Software Architecture decision in the beggining (I tried using the physics2d engine, which is pointless if the player does NOT control the run) and that wasted at least 50% of my time.
I loved the trampoline idea! That would be great! or maybe including things to soften a fall, like matresses, etc.
Your idea of speeding up the game I did not try because it would mean less decision time for the player... but now that I think of it, maybe making the player faster but then, as he approaches each obstacle or waits on a wall, making time slower, reflecting that in the music/ sound effects, or some animations in the background, would be a great touch!
And yes, you are right, I am obviously not good at art, and the sky decision was simply because I was already very late for submission and didn't want to try to draw clouds. Thinking about it, yes, a pure blue background would have been much more consistent with the minimalism of the stick man.
Anyway, thanks again and good luck and congrats on your game!