Dang... the RNG, after multiple time loops a vase spawns with a random item, but being random you can get the same item multiple times.
I will write Item stats here for future players, so you can see if you have better equipment avariable or its pointless to keel doing the time loop.
SPOILER!
Do not open the entire comment if you want to discover it by yourself
Weapons
Club - +5 Atk
Leather Whip - +18 Atk
Mace - +28 Atk
Flail - +35 Atk
Morning Star - +42 Atk
Great Axe - +50 Atk
Body
Robe - +1 Def
Cloth Armor - +3 Def
Magic Robe - +6 Def
Head
Leather hat - +5 Def
Circlet - +8 Def
Accesory
Amulet - +5 Atk +5 Def
At the end is not about getting good gear, but about spawning 8 jars and then meeting the sus man help you.
Still, I wanted to test if I could defeat the goblin, but
[Great Axe + Cloth Armor + Circlet + Amulet]
was not good enought, so I think is not intended to defeat the goblin by normal means, not really happy with that outcome...