Well, the tutorial and the sound effects(which is from sfxr) are probably top of the list of 'I didn't have time for this so I just slap something I think it's necessary in and boom move on' things. Sorry, for that. Maybe if I have a chance I would give it some update though :D. Thanks for your honest review. It helps me improving my skill a lot!
p.s. I think maybe some people might not like the music or sound effect so I slap some mute button in the game, man. That's a good decision.
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I know about the possibility to turn off SFX sounds but you need to know when you are getting hit which would also get muted.
Overall, I would recommend trying to think of a way to lower the number of people on the screen. This way the could get more challenging and maybe it could also work on WebGL.