Finally google released it on the Play Store, it's a version above this one, because the collisions are implemented, but for those who are having difficulties to install it can try to install the android version.
Which in some parts is much more unstable than this one, as it's the first time I've compiled the allegro library for android.
https://play.google.com/store/apps/details?id=br.com.armctec.alienattack