Surprisingly thoughtful challenges for such a simple setup! The physics are straightforward, and the advice signs are unobtrusive, but each of the changes in mobility makes a clear difference in what I can and can't do. Level 7 was where I started really respecting it, because I thought double-jumping would be the best power, but that wasn't true there. I had to plan what to grab and what to drop and when, which is all good.
You've got some mileage on this setup here. Nice!