Nice game ! The visuals & animations are really neat.
I don't play a lot of iddle games, so I don't have a lot of point of comparison but I can give you a few pointers :
It took me a while to realize I could click on the small excavators on top to harverst their inventories maybe find a way to make it more obvious or display it somewhere as a tutorial.
The metals and ore are not labeled so you don't know what you're harvesting. displaying their name on hover would help a lot.
I didn't find any display for your full inventory (for metal and ores) so I didn't really know what I had at any given time.
I didn't quite understand what the warehouse was used for in the game. I guess It's to store more stuff, but since I used stones & metals as I gathered them I didn't seemed to need it that much.
The automatic gathering felt a lot slower than the active one which meant I felt I had to click a lot. Maybe it would be a good idea to rebalance that so the player don't have to click so much. But that's just my opinion, don't only take my word for it. (again I'm not a big iddle game player ^^)
Adding a save system would help a lot. since it's a slow passed game it takes a while to level up very far. hard to do in 1 sitting. maybe put that higher in your list of priorities :)
Appart from that, It's pretty solid, the game is pretty easy to understand. The ramp up in values seemed pretty well balanced as far as I went. Didn't encounter any bug. And I was able to play while watching netflix (good thing for an iddle game I guess :) )
Good job :)