Hi Kristoff!
Thank you for your time playing our game and writing a comment - it's invaluable to us.
Internally, we all agree the game jam concept definitely needs some further polish - especially for the overall progression and introduction to game mechanics. But, I'd like to quickly address your final point about performance: the problem is far more than vsync!
We used signed distance field global illumination, and a few other expensive post-processing techniques for lighting and visual effects; it was a huge oversight to not include options for the jam entry. In the future, these settings (and window resolution, etc) are absolutely something we'll be allowing people to adjust in order to meet their system's ability. We've already begun using baked lightmaps, which are far less intensive as well.