I don't understand the point. I can progress the first dozen levels, then it becomes too difficult. I don't earn enough coins to buy upgrades, and spinning the wheel and watching ads don't yield anything useful. I've hit a wall in this game and don't understand how to progress. Otherwise, it's mildly pleasant to waste time reliving the earlier levels.

I'm on level 32. I don't allow access to any money, I don't get ads anymore. The ads only show up in the first few levels to get stuff. 👎no $ upgrade help! Upgrades come in levels. It goes through stages some levels are hard some are really easy. If you use your thumbs you block the screen, you die from no visibility. So it's better to use a small finger, have a position of visibility. Free stuff resets after 7 days. They help get through levels after you die for resurrection to continue.

I really like the look and feel of the game, the variety of aliens, graphics & smooth performance. But the app isn't free. Once you get to a certain point the ship is downgraded & you have to pay actual cash to have enough firepower to make it through the boards. Even though I have accumulated more than a million coins from previous successes, I can't spend them on what I need. The upgrades that I have won & purchased disappear before I can use them. And it's missing instructions in many places.