What a cool game! It's fun to play, the idea is great, and the execution is very nicely done. It's fun choosing upgrade strategies, and then seeing the consequences. It's hard to put down.
At times, I thought things like "well, I'll never need these stone upgrades again," only to discover that you thought of everything, and they do indeed serve a purpose, even in the end game.
I was *pretty sure* that there would be no bugs at all, because it is so polished and well-thought out, but I did manage to find some very minor ones! (Wow!) See the attached screenshot:
There are several things to notice:
First, in the big desert pane (where you can see the drones working in the desert), in the top right corner, under the "Drone Target" menu, "Claystone" is listed twice.
ALSO, in the desert pane, one of the white quartz stones spawned smaller than the other two: This happens when you use the bomb frequently on areas where an animation is in progress. You can freeze the animation in any state, including some scaled-down and translucent states.
Under the Quarry tab, note that the "TOTAL ROCKS" shows a maximum of 10, whereas the "STONE" maximum is 11. Should this be capped at 10?
Another minor point: In the bottom right corner, under the "Rocks" tab, there is no scroll bar to indicate that there is additional content beyond what is visible. I was well into the Stone age before I discovered that you could scroll down--which is necessary to unlock the next stage. Because there was no scroll bar, others might *never* scroll down, and therefore never find those upgrades, and just assume the game is a toy demo version, and leave (as I almost did).
But these are all very minor issues. You have a fantastic game! Thank you for making it.