As someone who plays a lot of visual novel demos (because I'm a furry who is a sucker for a good romance, heh), I have no problems with bare bones proofs of concept. It helps that, even if it's bare bones, you've got a solid and intriguing start. A clear mystery for the setting that sets a backdrop to a cast of unique and interesting characters to fall in love with. You're genuinely good with character writing, so be proud of what you've got!