Thank you for taking the time to share this feedback! There will definitely be more musical variation, and audio variation in general (sound effects, etc), in the final release.
I've been experimenting with mobile support. I'm encountering a few issues that I plan on addressing in time for the final release. As far as larger tablets, I haven't tested, but the browser version may behave well?
Good catch on that typo (another thing I'd like for the final release: a copy editor).
Again, thank you for your helpful feedback. I'll be considering it as I move forward!