I Can See the Status Bar

This author's books are unreadable without certain chapters, but single-player mode doesn't last long either. All I can say is, give it a try.

Keep it up! (Haha)

I'm here to support you.

Great read! Keep it up, author!

Here's a small suggestion: each time you leave the back room, you could add a little bit of plot description about the changes after the upgrade. Not numerical changes, but specific events—anything from showing off, slapping someone in the face, or doing something heroic.

Back room fanfiction is really rare these days. I wonder if the protagonist will go to that floor with the sea later on.

It seems to be a harem-themed story; this one is quite interesting.

The writing style is somewhat similar to mine, and at least it's a rare original work, which is why I skipped over all the fanfiction on the homepage to read this. I'll give it three recommendation votes to support it.