Whats the lowest android app size that unity can give?

So I just started my Indie Mobile game developing. Was wondering what is a good average app size unity can go to ? And what is the lowest for really simple 6-7 levels apps. Do more levels mean a bigger size?

There are already some other people who asked this.
But the minimal is around 8 MB, that includes all the necessary files like the Unity Player and default objects (scripts e.g.)

For each detailed level - assuming a good game - think of 1 MB extra.

Really simple; not even 100 kB extra