Im not sure if this counts as a bug, as i have kind of figured it out....
But your VN has non-standard button input, for example, Most VNs run off of Renpy, and thus the space button or a mouse click will advance to the next scene or dialogue; or the Control key will speed advance or "skip" manually while the tab key is auto skip; The "H" key is used to hide the dialogue and UI; and a right-click will bring up the save menu.....
For your VN the Space key functions as the hide UI, and it was rather jarring as i thought that something was wrong! If there is a way that you could either show your custom key mapping, or allow users to change the key mapping it would be a lot easier to navigate! i havent figured out any other inputs as of yet, as it took me a few minutes to figure out i was hiding the UI and not advancing in the "chapter one" opening screen! i thought the game was bugged and i was trapped in a loop!
i am unsure if this a difficult task/undertaking.... So i apologize in advance if this is a suggestion that you can't consider. Having custom inputs is absolutely fine! i just have no idea what inputs do, or how to find a mapping so i can learn or change to what i (and i think most VN readers) are accustomed to!