Thanks for the kind words! Believe it or not, I was planning to make an ambient track for it, but ran out of steam because of some coding and life issues.
What comes to the bug you've mentioned... That only occurs on web build and I've managed to notice it after setting up the web version. It was an easy fix, just two lines of code. Problem is, I fixed it for the Back button, but not for the New. It hurts (ㅠ﹏ㅠ)
I'll push the fix after the voting period ends. As for now, one can either get back to menu and start a game from there or just don't rush and wait for several seconds after the animation stops before pressing it.