Sorry if any of this is a repeat, I felt like it'd be more helpful to answer before reading the other answers. x3
1) What was the first scene that made you go, "oh this is getting interesting" ? What was interesting about it?
Probably the first appearance of Lushaka -- (a) I'm shallow and Lushaka has tiger feets, so I wanted to know what he was, but also (b) it's probably the first point where it feels like "something's up" to me. It's not like "ah, this is the main conflict," but more like "ah, now we're getting to see what's really going on here!"
I feel similarly about the Elyeo info that comes with the inductor a couple of scenes later! It's a conflict I understand on some level, one that I have enough pieces to follow and get invested in!
2) Did you lose your interest at any point in the comic? Or come close to it? Which point(s) and why?
Hmmmmm..... Red-hoodied child is flirting a dangerous line for me personally. I'm curious what his deal is but I sort of find Mischievous Knowledgeable Child an insufferable character type, so right now whenever he shows up I'm not thinking "gasp! it's that kid again! how mysterious!" I'm thinking "what, you again! go away! leave ethan alone"
but overall I don't think there are places I lost interest -- it's more like, I had to stick with it at first. Ethan getting pulled into Keol kinda starts a gradual exploration of this new world, and I feel like that's the point where I'm kinda waiting to see where this is going. Once I got there, I never lost interest.
OPTIONAL: What would you say is the main conflict of the story? Where is it shown in the comic?
I would say we haven't been given enough information to know the MAIN conflict yet -- I feel like I would be guessing! Danbi wanting badly to find out about his mother is a major one. Whatever is going on re: the inductors and why they're really doing what they're doing with the elyeo seems to tie in and be very important to the story. Ethan's desire to go home/figuring out if he even wants to go home seems important, but not in the same way -- this story feels like a way for him to deal with / come to terms with his feelings about his own family, something that the story is deeply "about" in a way, rather than being the central conflict.