First Impression:
Cover looked pretty, synopsis sounded good, and I immediately got a sense for what the story was going to be about. I was just confused by the second paragraph in the synopsis, it's not clear whether this fact is later revealed, and is thus a spoiler, or not. It would be nice if it were clearer. Except for that, you did good.
Thoughts on the Story:
Okay. We start things, and I like that we're quickly jumping into the action. But it's a bit too quick. The tone abruptly shifts from drinking water, to something jumping out. It would work better if you pause and give us a few moments with the dude thinking something feels off, or if he doesn't, make react more surprised.
Next, the battle scene. GodsChosenEmperor said it well; listen to em. It was inconsistent, draggy, and worst of all, repetitive. You could get rid of most of the rock throwing scenes, and it would work way better. Or just say he hurled rock after rock after rock. Keep things interesting and not boring.
Also, keep the dude's emotions consistent, or gradually dial it up! He turns from 'gritting his teeth', and 'ragged'; to 'unhurried', and 'swift' in the battle. Did he magically unexhaust himself while fighting? If he did not, don't make it sound like he did.
Next chapter. It's another battle. This dude has gotten no rest, no sleep, no food, he just walks and fights something else. He says he's trying to survive, but it feels more like he's seeking opponents out on purpose. He doesn't even attempt to run or turn unhappy when he's in danger. He just fights. Mechanically. As if you inserted emotions and motivation into the novel without actually bothering to make sure they were consistent, so this was the result. If you want his drive to be about survival, make him act like it, or change his drive and say he's empty.
Chapter three. Finally we get something that isn't fighting, and I'm reminded that this dude has no memories. This is nice! You give us a emotional, dramatic moment. Just remember to take out the repetition, again. The dude doesn't need to ask 'where am I?' two times in a row.
The shift to chapter 4 is nice. I want him to rip the hell outta that Leviathan, lmao. Then we're introduced new characters. Finallllyyyy. But again, we have the problems mentioned before. A slightly abrupt tone shift, cuz you went from fierce talking with the Leviathan to a more relaxed convo with the dwarf. And the MC's emotions are inconsistent again. He acts so relaxed, as if this isn't a bunch of scary trials, but an amusement park.
Lastly, we have a new problem called info dumps! First it's the dialogue. Nobody talks so conveniently like that in real life. I do understand if you think this is necessary, but I personally believe readers are smart, and can understand things through context, so authors don't need to overexplain. Then the next chapter, and oh boy! A big massive info dump on the status. I skipped past it. It's boring.
In conclusion: a fantasy novel with promise. It's LitRPG, yet not the same tasteless slop I see all over RoyalRoad. Right now it feels fun, but like something you'll skim over, or quit at Chapter 1 because that's the worst chapter. I look forward to seeing how you edit this one. Good luck!