Hey, thanks so much! :)
Thanks for letting me know about the bass, when I have time I'll try to mix everything so that you can hear the bass well too, it might be tricky to balance it for headphones and speakers but I'll see if I can find a way.
In my experience people tended to find the bell and the guitar difficult in level 3, but I haven't heard that much feedback on the drums. Was it the drums on the first level that were difficult, or all of them? Also by difficult, do you mean difficult to find or to play? Thanks for your feedback~ :)