There aren't levels yet just a random continuous game. I'm working on a challenge mode with different static levels. The ad only plays once you loose, so in theory if you never die you won't ever watch an ad. Lastly, the reason it accesses your files is lime Ren said in order to save screen shots. The next update will remove that and allow them to be shared directly with social media instead.

Unity ads have trouble on android 7.0, so I'm guessing you are the one person that downloaded it with 7.0