Thank you for playing and for the feedback! The sound effects were a bit loud on the default settings, but you can turn them down (and/or the music if you want) in the options.
I had a hard time with the last level myself, but DaniBits had no problems, lol. We wanted it to be somewhat difficult and a total change of playstyle, but also not block completion for too many people because of it. In the end, we think it's at a good point of difficulty, and we totally agree with you.