Could you please tell us which build you played? It's written at the bottom-right of the main screen (example: N-0.4.5).
Viewing post in Extended demo is now public comments
I pre-ordered the game, and the file name of the one I played in March was com.heartcoredev.thesymbiant-release.apk, the one in August was com.heartcoredev.thesymbiant-e0.4.0.apk, and the one I just recently downloaded and played when you posted about the extended demo being released to the public was this one - TheSymbiant-N-0.4.5-android.apk.