A good proof of concept, but if I may add a few notes that I noticed. The controls and feel of them could have been done better, you feel a lil slow and the input feels clanky (as in for a 4-dir controls, the vertical input overrides the horizontal input, instead of newest input overrides oldest input). Mining took to long as I needed to wait for the animation to finish (A big no in game design for a number of reasons, but if you wanted people to see it, you could have sped it up).
I did read your dev notes on the page, so let my notes be some player feedback (;P) I do think this mesh of genres would make for a really good game, tower defense + resource survival. Nice job for what you have here!