Very cool game, though the tiles will sometimes go completely white, preventing any digging (as I assume they have reached NaN and are interpreted by the game as having infinite depth).
This can happen at any tile at seemingly any point of the game, likely due to tiles updating very quickly.
Also tiles will sometimes just... undig themselves over time? Had a tile at ~180 for a few minutes, then I dug it again and it went to like 147. Very strange.
[SPOILERS BEYOND THIS POINT]
Also the scaling gets really wack. ESPECIALLY via the gardens. Can go from like 10k ft tiles to millions extremely quickly via the worm and gopher efficiency boost. Pairs very well with the Denisovan Bracelet permanent upgrade which got me like +10,000,000,000% research for every artifact. You probably want to give reachable hard caps to the one of a kind items so that people who buy them early aren't literally a billion times slower at getting research than I was. Also maybe make the other place a bit more useful, right now the only use is for discovering the bracelet (it's so forgettable I can't even remember its name).
8/10 game, my comment is only mainly issues so that they are brought to light.