Actually, "Kings New Life" is still inappropriate in this case, as it implies that the game is about the new life of many kings (which would still be grammatically wrong). Since King refers to the MC's codename,
"King's New Life" is the only grammatically correct title. King is a noun (name/title) and it's about his new life, so it's a possessive noun, therefore an apostrophe is necessary.
I hate being a grammar nazi (because people dislike being corrected, as that would mean they're wrong) but the title is the main thing that should be correct. I can forgive a bad Overview or even incorrect English as that can be improved with time, but the title is the first thing that people see, it's the most important thing to get right.
Just my critique from the previews: Models are overused, especially the MC's and I see 2 girls with similar hairstyles, hair colour & style don't match skin-tone & body type, lighting needs some work, and renders could use sharpening. Overall, seems like a generic foray into a trite genre, so you really need something unique to stand out (hot models/good story/top-notch visuals).
Incest+Harem is my favourite mix of genres, I play everything with these tags fully knowing how clichéd they are, so I will give this a fair try, but please make an effort to improve the language at the very least. In my opinion, there can never be enough Incest VNs, but there has to be at least one thing right/good. I see the potential in this, I hope you improve upon your work, best of luck
KingoftheJungle009!