I see a lot of potential and hope you will continue this story. English is not my first language as well but I mainly write in it. Therefore I did remarked places for improvement. Your grammar and spelling is good but all of what I will say can bring down the writing and the story or make it less appealing to readers. The main thing is that in IF most people expect the story to follow the proper convention the same way novel do. The more your work lean toward the fanfiction way of writing and storytelling the less attractive it tend to be for the majority of those readers. As many come from COG (a company that make IF and have their own engine) or are familiar with it. So all I will say can be discarded if you don't care about that audience or prefer to stick to fanfic conventions.
1 - I would advise to focus first on formatting and how to apply standard novel conventions. It is okay to use ** for an action in fanfic but absolutely not outside of it.
2 - Beware of overusing CAPITALIZE words or like someone else said ellipses. Too much of it in a phrase or paragraph can tire readers easily. Also it is better for dialogue if when someone is stuttering a lot, you don't describe in details and just do that.
ex : "I'm not sure." He stutter
Rather then.
ex : "I- I'm..n-not...su-sure."
As once that can maybe work, but multiples lines of this can make the reading less fluid. This is the same when you have to describe someone laughing. You avoid writing "HAHAHA" you just write that they laugh or cackle or chuckled, well, you got me. Make the text more smooth.
3 - I see a lot of telling and this isn't necessarily a bad thing, as IF tend to have to include a touch more of it generally. But here it make the pacing seem to rush and don't give us enough time to acclimate to our protagonist or get attached to Liam. I understand if your intention was to quickly bring the MC into the other world but I really recommend slowing down a little and developing what you got as right now. Our MC goes through quite a roller-coaster of emotions but none of what happened felt impactful for me due to all of it being undeveloped and passing in the blink of an eye.
4 - Just a little thing I think you should be mindful of in the trigger warnings and the description of the game. Romance doesn't have to contain sex scene necessarily or sex at all. And I know you didn't mean to hurt anyone. But this a hurtful stereotype as some people are asexual and among those some do not want sex but still desire romance. That doesn't mean that your game have to cater to them, many games don't. But I would advise revising that and being more explicit about how sex scene or romance/friendship will work and if the MC will be able to be asexual (the MC already seem to be heteromantic by default but in case of the friendship route you may want to also indicate if they can be aromantic as well) so and decide to have sex or not (some asexual are okay with having it or want it, it's a complex spectrum) or if the sex scenes will be locked to the romance route ect.
I hope I have not discourage you, trust me I wouldn't write such a long comment if I didn't see the potential your story and game has. I like your humor and can't wait to see your writing style grow as it sound really friendly and all it need is a bit of polished. Keep up the good work !