This game is awesome I just wish it explained more. At first I thought that picking up the ruby bag gave you a jump boost. I also didnt realize it was a ruby bag.
It took me a while to realize it was weighing me down and thats why I thought it was giving me a "jump boost" until I picked it up again.
I also didnt realize you could return to the starting area to cash in your rubies which led me to call for help and lose all my rubies a few times. The items are cool but its so easy to waste them by accident, I also did not realize they persisted between runs.
Managing your ruby bag is cool and innovative but the game has issues conveying its mechanics. It has the bones of something awesome it just needs a better tutorial or some way of explaining these things to you.
Good job though!