Neratte Tsuihou sareta Sousei Mahoutsukai wa Isekai wo Ouka suru

Abandoned by his fellow heroes in the middle of conquering a labyrinth, assistant magician Rick is granted the all-powerful "creation magic" by a goddess in a mysterious space on his deathbed. After somehow escaping the predicament, he returns to the party, but tired of his companions' cold treatment of him, he plans to deliberately get banished. Now free, Rick is sure to enjoy life in another world, but his second life is full of troubles, including an encounter with a girl with a secret, past grudges, and a showdown with an unscrupulous merchant!

(Source: AlphaPolis, translated)