I love the simple but nicely done art. The mood is there.
I would love a game like this with a player controller a bit more sharp.
I feel half the time I fall was because of slippy pixel I don't know ahah.
Maybe you could also add an area at the start that makes you understand the core mechanic of the grab before going into the first pit ! Like small stairs, one first easy jump and all.
But love the mechanic of jump grabbing my way up. Very cool good job !