Hey hey! Sorry my reply is so slow, I've been ill since before Christmas, and only just starting to feel well enough to get back on my PC >.<
Were you playing on Windows or Mac?
Either way, it's probably an issue with screen resolution not matching the settings that the game was optimised to be played in (16:9 - 1920x1080), so if it's possible, you could try going into the settings and changing them to that. If you already have it set to that though, I don't really know if there's anything I can say that would help >.< It doesn't display like that on my PC, but I know it has displayed like that for a few other people with different monitors than my setup :(
Most likely it will be a case of me having to try and lock to one resolution in a future update or something to stop it from happening.
And if you happen to be playing on Mac, even if I update the game, it might not help because weird bugs seem to happen on mac that don't happen on windows T_T and since I don't have a mac to test on, I have no way of knowing they exist or how to fix them >.<
Thank you for checking out the game anyway :3