Visually it's mind blowing, I loved every little animation.
The gameplay part, well, it's quite broken, there's no way you can see what's above you and it's a big issue with higher jumps, pickaxe can crash with any gem and sent you flying fast enough to the bottom if you're unlucky enough.
I wish pickaxe could be automatically deactivated when it's not swinging or have a bigger dash to compensate, because not knowing where to place your weapon before jumping is a big issue.
Still, this reminds me of hopping tenshi, a game I have very fond memories.