Well...
First, mining games are great! This, though , needs improvement. I really really CAN'T enjoy this game without some fixes to some bugs. First after you enter the shop you can only go right. If you go left you enter the shop - again. Maybe use trigger buttons like shift or something. This game also needs more elements. Try adding more upgrades. Take examples from other games without copying the exact idea. I'd like to give you a better score, but this game feels really incomplete. I find the concept fun and the wood idea was a good touch, but 4/10 and 3/5 is the best I could give you.