The premise is fun enough, but the writing can be really annoying at times. A lot of things feel like they happened in the wrong order, or characters just blatantly forget things they've learned or shut ideas down before even trying them.
First few loops, he finds determination and says "Ok, I'll grind!" Then a few loops later is completely hopeless despite making progress and tries to off himself. Then whiplash again as after spending some time talking to his childhood friend he is okay and back to the grind and not hopeless in the slightest.
At one point the MC finally gets a partner, and he hasn't seen her fight but he immediately dismisses her as too weak when she says she can do it.
Same character gets caught in the death loop, and the first time she does she is entirely okay with it. Second time, though? She immediately breaks down and can't do anything. Huh?
Edit: It only got worse as time went on, especially the ending. If you still decide to give it a go, I would recommend dropping it after the first "boss"-type fight.