Pretty fun game, and good art!
My only criticisms are:
-The jump-down dash needs a cooldown. Accidentally double-dash-dying and losing 2 lives is frustrating.
-Less jewels and more minimalist (Only with the the main collectables) and all different colors is off-putting and they are en-masse, I'm not sure with my brief playthrough if it's possible to collect them all.
You can imagine a scenario where the player collects them all in a row but one. Well, I was perfect enough but my very slight direction made me miss that one out of fifteen that were on screen.