Really nice game! I really enjoy the aesthetic, especially all the effects. The way the rocks glow when you mine them is so nice. The ambience is also a nice fit.
My complaints are mainly about communication. The fact that I can double jump and dash feels like quite an important point, but it's never explained. I was stuck in the first "room" for a while, because I didn't think to double jump. Small problem, but you don't want players to start frustrated. Similarly, the boss fight when you get the cannon threw me for a couple of reasons. First, the enemies have no reaction to taking damage, so I'm never sure if I'm missing, or if they're resisting the damage. That was fine for the bipedal ones, but not the long-legged thing. Second, the rocks on the long-legged thing aren't the same colour as the ones I'd been mining thus far. It took about 5 minutes before I thought to switch weapon. To be clear, I think that's a really neat mechanic, and a fun fight, it just needs more feedback to keep it from getting confusing. Also, I think a clearer "colour language" might be good for this game. Like "blue things are helpful, orange things are harmful".
I think you've got something really neat here. I hope you'll polish it up so I can really get into it.