Wdym compressed? You mean extract?
Yes but the game won't install it self you have to install it on your own so follow these steps
1.do you have "Zarchiver"?
>no. Download zarchiver on playstore
>yes. Proceed to step #2
2.open zarchiver go to downloads folder then click the "Eternum-0.7.zip" then click "Extract to ./<Archive name>/" button
3.after extracting open the "Eternum-0.7" folder then install the apk
4.open the apk and grant storage storage permissions now close the game
5.go back to "Eternum-0.7" folder then cut or copy "archive.rpa" by long pressing on it
(Cut is faster then copying)
put "archive.rpa" to documents/Ixalon/com.caribdis.eternum/game
Inside "game" folder
6.now you can play the game