Thank you for playing! The game actually has a sound menu in the preferences so you can tweak the levels, but I probably should have changed the defaults before shipping.
OK, I've checked this out. It looks like that's what Android does while it's preparing the package to be processed by the installer, so it should be a case of waiting it out? On my device (a oneplus 3, so quite high-end) that screen appears for 5 seconds or so, before moving on to the install prompt proper.
sounds like the apk might be corrupt. Try redownloading it, and I'll check it out in a bit to see if something's wrong with the package. Can you tell me what your version of android is?
