Had a lot of fun with this! The little text in the end gave me a chuckle as well, and felt like the AI/Robot thingie broke the 4th wall as the dev.
Feedback: Towards the end, I could barely make what was on the screen, everything was just a soup of pixels. I did not even know how the orange ore looked inside of tiles and on the ground until I had 30k~ of it, when I stopped and took a moment to make out where I was getting it from.
Perhaps there is no need to spawn yellow and blue coins in the lava zone, as they seem to only clutter the screen and have no real purpose.
Or, perhaps a resource convertor could be added, to help keep the lower tier resources relevant.
Nonetheless, a great little prototype!