Spoilers i guess:
Someone appears to be a Kamen Rider fan. I'm not quite one of those, but I hang in those adjacent spaces, which is why I was kinda wanting more for the designs. You set me up (and I AM more of a fan of magical girl works), and then I was just whelmed at the appearances. I do appreciate the work into doing custom spritework as someone that is also not quite as adept at the visual arts, but I think you missed some attempts at embellishments that would have taken even simple designs further. Like a quick googling of Kamen Rider designs usually shows like a breastplate often. Or maybe we could have had more splashes of color corresponding to their solar body, like in an armband? Gray vs Black isn't the most striking palletes.
I do, however, appreciate the background filters you did. They gave a nice aesthetic to the piece and a good ambience. On the other hand, your characters ages were ambiguous and felt like seeing the adult actors in a CW piece, sorta outa place. Alternatively it felt like the drug dealer crashing the preppy kid's parties in Life is Strange-- something uncannily off.
You had some clunky dialogue at place, and the romance never quite reached fruition (as per the terms of the game jam), and I'm still kinda confused at Daniel's "adopted" son status in Xavier's family? I maybe could have benefited from more of their interpersonal relationship being explained in lieu of the opening soccer scene?
I don't know how well a monster of the week narrative applies to a visual novel if it's lacking like the corresponding visuals accompanying it-- the fighting felt a bit clunky in the sense of "mark did x, daniel did y, mark did z." We needed some internals to break up the flow or alternatively, Sfx/visual cues of violence to help smooth that over.
I still do appreciate your take on the narrative, as it stands out a fair bit from the others. This was a solid attempt and I think shows where your vision could do with perhaps another set of eyes to note out some fine details that slipped past your own (a classic issue that I know all too well).