The game crashes way too often when running wave missions. The game also crashes when trying to watch ads to revive which is annoying and infuriating. Update: After one year, the same issue still persists and the only thing that I have gained so far as a solution is just 100 gems and some coins from Habby, in addition the new weapon takes way too long to grind for. So yeah the way they try to "fix" something is to shove you with in game currency and coins to hope that you will change the rating