Sorry to hear that :( We didn’t encounter this in our tests but unfortunately there are others with the same issue. I’m hoping we can fix this in an update. Could you share your OS, CPU and GPU type?
If you have the time and will you could also help us a lot by sharing the outputs of the developer console. You can open it by pressing F12 (Chrome/Firefox) then clicking the button to load the game. Some error outputs are expected (typical jam experience :P) but maybe there are more for you that could lead us to the fix.
Apart from that: If you still want to try playing the game, a safer bet is probably the downloaded version :)