I'm very nearly gave this 5 stars when I first played it in 0.2; it's great, and I was eagerly awaiting 0.3. But I prefer to wait for at least one update before leaving reviews, as that gives a better perspective.
It's got good, diverse, girls, with personalities and goals and stuff. They're good looking, and the sex scenes are good.
The plot is good - a reasonably dramatic Isekai mystery.
There are some typos/grammar errors, but they don't materially detract from it.
The romance is not instant-fucking, but not super slow burn either. Which is appropriate for the girls, but not for players who just want mindless fuckfests.
One criticism I have is the ratio of plot development to LI relationship development is a bit high. The LIs should have more screen time with the protagonist to increase the impact of their relationship.
As for 0.3, sadly it wasn't all I had hoped for. It certainly wasn't bad, but its greatness didn't leap out at me. The sex scene wasn't that great, the soundtrack stopped at various times, the gallery was missing scenes I had unlocked, and the story was a little too mysterious.
On the plus side, there was good development with two LIs, an epic battle (blowing away anything else I've seen in a VN), some unexpected twists, and some decent emotional stuff.
This is why I usually wait for an update to rate things. It gives a better perspective.
My evaluation of Cross Realms has gone down, slightly, with this update - although I hope that some bug fixes will come soon. I don't think the dev has lost their mojo or anything like that, just a random fluctuation at play, and it's too good for me to be worried.
I'm still going to give it 5 stars, although I had to think about it a little.