Hey! In the current version, both shovel and pickaxe upgrades make your Golems stronger but there is a slight bug where the Golems can mine stone without you purchasing the Pickaxe. This has been fixed in the next update!
The chance that golem digging at edge/corner is sort of too low, which makes the ground ... IMO ugly. (e.g. depth 500 vs 300 vs 120)
It sure is ugly… I heard the Golem’s don’t like the mine near the edge incase they fall off! I will have words with them ;)