First 10 arcs are fine and I wish author stopped at this, but no! Author proceed to create arcs where ML suffered needlessly because of MCs s*upidity and following orders. He is a transmigrated person, meaning he DID NOT HAVE TO follow the rules of the world and yet he did. He could have bet on ML, but he didn't. He could have saved him like he was supposed to, but it was always ML saving MC! So what if he's a regular person? He has POINTS! He has a system! I cannot believe he let ML go through so much pain agreeably

You can't say all MLs is one person... and that is problem. Like you can feel his story in every world. Closer to the end you can feel his story in real world but you CAN'T feel connection between MLs though your mind KNOWS it's one person. Nothing except love and paranoia. (And it can be in any person.)

The second part of this problem is MC. He has no memory in every world so it should be just blank paper. But we can notice unexplained changes which have no connections with his memory... like the attitude to the ML is really changing from world to world while it has no reason for it. Though it's not so noticeable. It's closer to feeling.

The beginning is very good and has good pace. Author really thinks about the problem of different life expectancy, moral etc. In 2 arcs we see the end of MLs life. In the 3d arc we just can think that the both are almost people so the end is close... but nothing in other arcs (except 2: one somewhere in the middle and last arc). Yes, author wrote about difference but it's just 'oh, yes, it's problem'. Maybe lovely HE is good end but it's too many questions in the novel, especially when we already had real examples of absolutely not trivial end of monster... The first unwritten part.

As I mentioned already, MC has no memory. No real memory and no memory about previous worlds. You shouldn't wait that at one moment something will go wrong and he'll remember previous world. No. He'll never remember previous worlds. (Only some accidental spoilers by system but they are toooooo weak.) But he's remembering real world... and here it's another unwritten part.

Firstly, recovery of memory is too nonlinear. At some points it looks closer to a piano in the bushes or a plot crutch. Btw to the end of all arcs MC don't have all memories... nevermind, it's okay but if memory has some weight but no! I think it's crutch cause the impact of memory is not stable.

I can't see any changes in the MC with some memory and without it. MC has some changes but they look more due a lot of worlds (though he can't have such changes without memory of worlds -_-).

And the real world memory has some impact only in moment of appearance. It can be logical, yes. But if it has any other uses except tears at the moment of appearance. (Yes, sometimes it fits very well and you can cry too.)

Okay, here I can't without example:

MC had sister. She died earlier and he saw how it happened. After this we had an arc where MC had sister, remembered some information about sister, lost her again, remembered some more information and that's all. Like it's not the only one arc with sister. He would have another one later but MC didn't become closer to sister or at least just compare/think 'oh, she doesn't look like my real sister'.