Yes i know the web build is glitchy for some reason web export is a bit flawed right now, but it works perfectly on firefox (in theory).
As for the cut off screen the information says right under the game that you should put the browser in fullscreen.
I don't know how to do a proper how to play description and I didn't have time to think about it so I don't even expect anyone to understand the game mechanics :P
Thanks you for the feedback tho it's really usefull :D