Are you trying to update or install fresh?
While not with this game specifically i noticed that sometimes the old versions causes trouble when installing an apk. If you have an old version installed try uninstalling it and if that doesn't work relocate the save files (so you still have them in case even this doesn't work, but they aren't noticed by the installation program) the folder should be under /android/data (called "com.fourminutewarning.ravager) just get it out of android (I put them into downloads when doing this)
Other than that I could only think of the possibility of maybe your device not being compatible (and maybe getting the tablet or phone(mobile) version mixed up, which was already suggested as possibility)