Progress is stuck in this game, forever.
I love playing these kind of action games. Makes me relax and spend some time when I wait something. I played for 2 days straight to check this game and decide whether I have to invest and pay for supporting this game or not. This game is like all the others, the same in progress. Nomatter how much you play, nomatter how effort or weapons or upgrades you get, you are in the same difficulty. I dont mean the level. But yes the difficulty of the levels are all the same. For example, if you are at level 5 and you gain after the battle lets say 100K stars to upgrade your ship, the difficulty is actually the same again if you at level 14 which I am right now and I have 25billion of stars to upgrade, well guys the difficulty is the same. The game lacks of progress, you are stuck in a loop of playing again and again with the same opponents, the same rate of death/success and same ratio for update. If you needed 100K to upgrade, you now need 1M to upgrade, or 1B to upgrade. I am uninstalling this game because of this, otherwise I woudn't have any issue to invest and pay.