Overall, great job! Love the Downwell-like aesthetic, and the core idea is really neat! I do agree with some of the other commenters that the scoring is a little opaque, and that I wasn't sure if the game was actually ramping up in difficulty as I went on, or if I was slipping up, or if I was just getting unlucky in terms of the amount of fuel blocks and TNT that were spawning in. I managed 47k on one of my earlier playthroughs, but in later playthroughs often got only a fraction of that score without really feeling like I was approaching things any differently or playing any worse. I'd be curious to hear what the fuel/treasure spawn rates are like and how those are determined/change over time and stuff like that.
Another thing is that the alarm buzzer sound that played when I died never stopped, meaning if I wanted to play again I either had to power through the alarm noise blaring constantly, or restart the game entirely.
I'd love to see other enemies, or the ability to move the drilling platform somehow. I think either the ability to move the platform or maybe certain blocks/obstacles that force the platform to move could make things feel much more dynamic and evolving.