I was a little confused at first but then I reeeally got hooked once I understood it. I feel like a kid playing CoolMathsGames during class again, and I mean that in the best way possible. The gameplay loop of collecting the ores, seeing them shoot up the tunnel, and then upgrading your drill to go further and further is just so satisfying. The abilities add a whole new level of skill and strategy with trying to use them at the right times and there are just so many cool ideas. Did you seriously make this on your own?
It's a shame there isn't too much to do with your money after you get all the upgrades, it would be fun if there was just no limit and you could become absolutely overpowered haha. Then it would be really hard to stop playing.
I reached day 23 before I had nothing else to do with my money and went to try and get as deep as I could, but it can take a proper few minutes to get back down to the level with lava, but I burned and then just gave up after that.
The game is already fun and satisfying enough, but some sound design could go a long way. Even more abilities, and maybe upgrades to the abilities could help extend the game even more too.
I'm glad that you found and rated my game so that I could discover this one!