Glad you were able to get it, and sorry about that glitch. Could you let me know what device and browser you're using? I haven't been able to reproduce the issue on my end.
Thanks for confirming those bugs!
After some further testing, I found that the issue happens because of the resource usage from rendering the falling sand cells. It doesn't happen on newer devices. I've added a Graphics Quality setting that lets you disable the sand falling animation, which should help with the issue.
The sound effects should now also play without delay during the initial load.