ShadowKatake here, and I'll answer any questions you have about this novel in the comment section under this review. But for the predictable questions, I'll answer them in this review.
Q: Is there romance? And if there is, is there a harem?
A: Yes, there is romance. However, there is no harem. It's literally in the tags and I don't deceive readers with those tags. However, I didn't add the romance tag in this novel since the romance tag appears on top of other tags so if I add it, my novel will be labeled by Webnovel as "romance" instead of "system".
Q: Are there any lemons?
A: No.
Q: Is the MC smart?
A: Yes, he is. In fact, he is portrayed as a perfect character who is bored with life and wants to entertain himself to relieve his boredom. He isn't power-hungry but rather, he wants to have fun. In his past life, he is the peak of what a human can achieve and he is a prodigy. So, I will never write a situation where the MC makes stupid decisions just for the sake of plot.
Although intelligence and wisdom aren't directly synonymous and the MC is just peak prodigy-level talent and is more towards academic knowledge, I can at least guarantee that the MC isn't stupid enough to reveal his system to even his family or have plot-induced stupidity just for the plot to progress. He isn't Beta and he won't be taken advantage of by others. And if he seemed to be taken advantage of, that's the MC letting others take advantage of him so he can take more advantage of those who had taken advantage of him.
Q: Who is the FL or the MC's love interest?
A: It's the system spirit of the God-Level Game Developer System.
Think about it, who is someone you can trust, useful, and won't be used as a hostage against you? The system, of course! If you can't trust even the system, might as well transmigrate without the system or just test your luck in the next life.
Q: Will the novel revolve around the MC?
A: Well yes, but actually no.
Remember, the MC's golden finger is the God-Level Game Developer System. He creates games so I will introduce perspectives from the players who played his games as well. However, the MC will always outshine them so he won't be overshadowed by any side characters.
Q: Is the MC good or evil?
A: I can write a separate review just to explain this but to cut it short, the MC's alignment is True Neutrality.
He just does things for fun and to relieve his boredom. However, he won't make others suffer unless he deems that they should suffer (such as his enemies). To elaborate, the MC is the type who will answer "sacrifice one life to save five" if he is asked to solve the trolley problem. He is also literally creating games to train humanity and let them have the power to fend off against otherworld invasions.
Q: Will the MC steal and plagiarise games from his past life?
A: No. The MC calls himself a prodigy for a reason. He won't stoop so low to copy existing games from his past life. (Btw, by past life, I meant in real life Earth. I don't intend to infringe any copyright so the games I created in this novel are all created by me but with some inspirations from already existing games, but not blatantly copying it. However, there are some games in MC's past life that aren't available in real life Earth such as Fantasia Online. MC will copy that game but not completely.)
Q: Is the grammar good?
A: I can't say that it's top-notch, but it's readable and light to read. It's at least better and more readable than most of the novels in Webnovel.
All in all: If you have any questions, just comment under this review and I will answer them. This review literally has more word count than my synopsis ;)