The game might need to be a little bit harder because I only increase damage when I rebrith and when I get gems I just use the pickaxe that deals the most damage and then when my automine is high I just pick a rock that can be destoryed in one hit and it gives me a lot of gems I just pick that rock and be afk then after a little while I come back and then I see myself have a lot of gems and then i use them to make better pickaxes.
:)