This is not true. I have over a decade of experience drawing in a traditional horror manga style. There are even videos on my Youtube channel showing me illustrating character artwork for the game from blank page all the way to inked/colored/implemented artwork in-game.
I removed my comment because I believe you, and it's definitely plausible you're just paying homage in a realistic way - there's a bit characters that look very similar in pose/design to the characters in the screenshots here, and your style is clearly very inspired by that genre of 80s-90s horror manga (which is fine) but the similarity seemed more. I did find your illustration website though and I believe what you're saying - they're meant to be simplistic designs because the characters are mostly ordinary people (+ monsters) and to make it easy to ensure continuity across pages, and in this case it's likely just coincidence & you being strongly inspired by that style of manga art, apologies.