Just played the demo last night and I must comment how I enjoyed it so much! Sci-fi like this is not my cup of tea, but somehow your game made me enjoy bits of it!
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It's hard to find visual novels that utilizes motion in its graphics and sprites, as well as sound effects to make the events come to life even with simple moving pictures. You weren't exaggerating when you said some characters has over 100 expressions which is a lovely touch to how their dialogues play out, but without the voice-acting (Kickstarter possible, as I heard, wheee), it'll have to make do for now glancing up and down to read the texts. The part where they're approaching through Erwani was also wonderful.
And speaking of Erwani and other alien characters, I don't know how you made them likeable, but you did. So far, starry-eyed Daeon became my instant fave (seeing his profile here made me think suspicious of him, though). Both him and Iyalen are both cinnamon-alien rolls. The language barrier here, even though all of them speak in perfect English, got me in hysterics. I'm also surprised liking the protagonist here as a real-life character, distinct from controlling him as a player. The dialogues here are indeed natural-sounding. Aliens feel relatable enough for humans without being human-ish at all.
Story-wise, I got hooked enough for the fact this is all about getting different species together in some adventure in a (star)ship. The transmission at the very beggining is delivered pretty well-- I felt a bit of goosebumps, prolly due to the graphic motion doing its magic. I haven't tried the romance bit though, and although flirting isn't a bad thing in general, the simple "Flirt" option felt off to me. I imagined the conversation between Sarah and Trey was more of a serious side, although intimate, so having an option to just flirt doesn't sit well with me. Take this as a grain of salt though, as this is my opinion: perhaps adding a bit more context to the flirt option, maybe?
I have no complaints to the gameplay. The fact that we get to have our own RPG-like (D&D, even) choices in making our character more personal and unique to the player hyped me to play the game. Though there are a few moments where I am confused, like the time when Trey is supposed to pick up a weapon before heading off. The highlight may not have been obvious at first; I'm used to the mouse shifting if it's clickable, unless that's just my own experience. Using Windows 10 here.
I also don't see any game option in the menu, whenever I try to tweak the audio. I had to save the game first, go to title menu before changing the game's audio settings. It also seemed to be resetting whatever I tweaked to default whenever I visit that section, though I cannot tell if what I tweaked changed to default as well or not. I only found out there's no exit button in the title menu and had to alt+tab and close it manually, if it's fullscreen (can't also toggle fullscreen in title menu, if that is any relevant as well).
Aside from these little issues, the game is wonderful. Immersive story, complex gameplay (quite a rare find in VN these days), and ear-candy soundtracks...this visual novel is among my top list for sure. Looking forward for its completion!