1.sometimes I don't get my leather helmet and chestplate back if they broke
(Why don't you use unbreakable tag)
2.iron golems in solo mode are invisible and invincible sometimes
3.I think tnt and fireball are too expensive
The prices in one game is very important. If are expensive the prices the player won't to play in one difficult game. The cheap prices is better. For tnt ball from 6 emerald was better to be 50 or 64 iron
If it's more expensive in my opinion it's better because then it's harder to get it if it was cheap then everyone would have it and it would be so hard cause constantly you get attacked with fireballs and things. So I think it would be better Xd.