I've made quite a few changes based on your feedback. As you can see with the new screenshots, I've rejigged the Level and Pause buttons, so there's no overlap on the top row. Audio doesn't end abruptly and other bugs you've pointed out. I've also added your name in the Thanks list of the About screen :)
I need to do a bit more testing, but if all goes well and I get the achievements finished, I should have a new version up next week.