Well, I know Sel isn't tolerant to a lot of things, yeah, but that's another topic. I posted here an independent opinion, and Sel's own opinion is not relevant here.
Sure, man, let's see some things you blatantly copied:
1. Music.
Yeah, it's royalte-free, but it left a bad taste anyway. You listen this music and immediately have thoughts like "meh, already used by another creator". Be creative! You don't need to repeat after Sel.
2. Characters.
Sara Hina is a bar owner and this bar is not popular.
Sana Yokubo is a girl with speaking problems and stuttering.
A strange godlike being called Sekai.
A cute geek girl promoting Raid? With even a similar event name?
You can be better than this. Add more unique traits, don't use same names. Be creative!
3. Plot concepts
Resets? Seriously? Why not use a different plot twist?
A person asks MC to not pursue a girl before beach episode? And you can break this promise? (also, broken in your case cause you can kiss Yokubo before Shuu even asks you about this promise).
DnD game sessions in any event chain? Be creative, you're just reusing another one's plot concept.
4. Other
"buried beneath your feet" - you don't need to steal phrases even as allusions or references
God god - you don't need to steal phrases even as allusions or references
lust and love points - be creative, in your case these points aren't even used properly, why steal a system and don't use it?
I can find a lot more, but I suppose this is already enough to point which parts are bad. You can do better. You don't need to take all these parts from Sel to write a good novel. You're already doing a great job in original parts. And yeah, events need to be at least twice longer, some of them are extremely short.