Very amazing idea! I know this is more of a prototype/proof of concept that we are playing, but I think that this idea is amazing! I have never played a game quite like this... it's very deceiving how complex it already is with just the pick, rope, holder, bag and gems. I had a blast getting through this little demo! The mechanics are very fleshed out I feel; just need some work finessing the controls and the feel of it all, and then of course more levels, etc! Thanks for the gamepad support by the way! Very nice.
Feedback: the main thing I think in general is to speed up the movement a bit, walking and especially climbing. I think that the controls could be tweaked just a tad also to be just a bit more intuitive. I felt I had to think just a bit too much when picking up items versus placing/using the items; that is pretty minor though, no pun intended!
Overall I think this is a great entry! I wish there were more, but the idea is great and your implementation so far is fantastic I think! Keep it up! If you plan to improve it then I def want to follow your account(s).