You know, I totally agree with you. I actually thought about making it so you can breath while running, because it would be more realistic, but honestly I had this specific concept in mind where you had to juggle it all separately, and I don't think it was ultimately successful. The jumping thing also occurred to me, and if I could do it over again I'd remove a lot of the forward motion from the jumps. But as you say, I do think there's something here, maybe to be developed into a different game at some point. Thanks for the thoughtful feedback.
(BTW I'd love to play your game, but I only have a mac. Any chance of a web build?)