I've spent well over 10 hours playing so far and all I can say is story-wise, Cross Realms is excellent. This can easily be a huge game time wise and I hope DuskDuck goes that route.
The only complaint I have (and it is a big one) is that only cock is shown during H scenes and it is lovingly rendered in its full glory. During these H scenes, no vagina and no penetration is shown. If I only wanted to see cock, this would be a non issue...but I don't so it is an issue. If Cross Realms was not an AVN (read: Adult Visual Novel) this again would be a non-issue.
My Rating:
Story: 5 stars
Art: 5 stars
H scenes: 1 star
Total Average: 3 stars