5/5. Its a excellent work you did here, and it its free! a thing that would be great its if you add in the tracking ui, the time to level up, levels gained, not just the exp/hour :D And i have seen that it stucks like 1.5~2 sec after putting the ore in the belt. Would be great if it could speed it up that bit :) since that 2s delay stepped here makes it a bot-like i think!
As i said its a AWESOME work you did here, if you ever move to a premium version i'll be glad to follow you!