Aside from some personal preferences for the characters, what's already in Penlight is great, but I'd honestly just like to see more content in the game. All the endings sort of leave you high and dry in terms of outcome, if you go the good route you'd expect some kind of conclusion for the characters and really there's very little "outcome", it just sort of ends, and that goes for all of the endings, they all lack substance. If you choose to go the "darker" routes, well, none of them are particularly dark. Being frank, going into a hypnosis-themed visual novel with an erotic tag, you likely have some less-than-moral expectations and the game just doesn't have that. Being able to completely control anyone is an avenue to having just about anything, and the protagonist doesn't explore any of it. Naturally, that's part of his character, that lack of confidence, but that is an opening for character development and one of the primary advantages of visual novels as a medium, he can greatly change that behaviour depdending on the choices you make.
What I would have to say on the current release of Penlight, then, is that it's great as a demo, and I'm definitely interested in the project, but it needs more options on what you as the main character choose to do both for yourself and to your classmates, how you want to end up and what happens as a result of those ambitions. Basically, a massive expansion on the story is really needed to bring the novel, and its fantasies, to life.