Can you put some details about the Classes in the Discription?
I get that the different classes start with different items. But i can only see the Miner with abilitys too. (well, didnt play the fighter much though)
The Miner has an insane mining rate and can craft a lot with his bare hands. he's a oven, he can smelt things.
What does the Builder get? Not increased crafting speed. Is it movement speed? can't be much i didn't sense any difference. Maybe some recipes are cheaper if he crafts them with hand?
Please tell me more about the Classes.

Right, there is information about them all on the forums, but I will add it on here too.

Oh, and the miner probably feels overpowered because he starts with a steel mining pick.

The builder does get a 20% crafting speed bonus, but compared to Miner's mining speed bonus, it's probably a little low.

I'll consider a rebalance, thanks for feedback.

I agree that the mining speed is a little too good, it almost always my go to class for this reason.