Sorry the game doesn't run well! We are aware of the problem but it was within the last few hours of submission and I couldn't really do much for optimizations at that time. If you can't run it in browser there's a downloadable windows version (though you may not have a windows of course).
As for the volume warning... Well yes it could have been set lower to start. But most games often blast you with sound for no good reason when you start them up and as such kinda kept it in for that reason. ... It's not good reason mind you but I couldn't resist it being a bit funny.