Really good, watching the mountain shrink made the progression very satisfying. My only complaints are there isn't enough things to spend money on later in the game and its unclear how close you are to unlocking new upgrades which makes planning how to spend money a bit frustrating. It could also be interesting to have more methods to go about mining as the dash boost(while very fun) gets outclassed by just continuously using the drill after some levels in the last digging speed upgrade, which does get a bit repetitive. Other than that this was a very fun experience and im looking forward to future builds.