As much as I like the core idea of the game... First of all, let's state that the execution isn't bad, is just lacks polishing. And sadly even is some rather critical parts as well.
The player movement feels way too slippery and hard to control (especially mid-air). It is really annoying when this leads to dying.
The other notable problem is controls. It there any good reason to use WAD to move, but the arrow keys to dig? I think it would make much more sense if it either only used WASD or just the arrow keys.
The main idea, of having falling blocks, and build up the terrain like this is creative and fun. And having to dig out treasures is fun.
Overall, good job!
P.S. Since itch.io refuses to show our submission under my posts, here's a link to it:
Holedown by Harman Kamboj, Arcy and kintrix