I spent 1100 Derium and it didn't level up my iota pin once. I really like the game but it still feels rough and unfinished. I think you have the bones for a great game but I hope you keep cleaning it up.
You cant level up Pins with Derium. You can use Crysblood or Derium to tune Pins. Keep loging in to get free Derium, I also do giveaways for players who logged in during last 24 hours (I have already given 1,700 free Derium this way)
Miners, Miner Multi and Hardness all affect miner damage. The get up might be slow...but it all catches up in a few. Hardness increases price the least. I'd suggest focusing on that as well as your speed. (Still experimenting with formulas as well)
You cant level up Pins with Derium. You can use Crysblood or Derium to tune Pins. Keep loging in to get free Derium, I also do giveaways for players who logged in during last 24 hours (I have already given 1,700 free Derium this way)