Indeed, that section is a bit demanding; we lost a few hours trying to find what was causing that lag, but unfortunately, we did not have enough time to allocate to that issue... as well as to the graphics settings.
Once the game jam is finished (so you can rate the game based on its current state so we have a fair rating), I will allocate some time to implement graphics setting, maybe this will be enough to let you play it. We do plan on finishing and releasing it, since we still have a lot of story to add, as well as more gameplay mechanics.
Thank you for the feedback, and we are really sorry that you cannot play it properly.