Found this from your reddit post, had to play it and really glad I did! First thing I like was that vast changes in each route. I love how creepy he gets in the close shots, like his eyes make me want to run away! So yeah I think Riker's the right mix of deranged and hot. Unsettling atmosphere and character, nailed.
One suggestion is that I'd like to learn more about Riker. I know the last day isn't out yet, and I don't necessarily need a deep dive into his entire history and why he's like... yknow how he is, but I would like to know more about what he does for a living, or what he likes(aside from MC lol) and dislikes. Maybe split up little tidbits behind each of the endings? That might have already been your plan lmao.