Uboat Attack APK 2.21.1

5 stars: Fun game! Toooooo many ads!!! Sometimes the ads don't bring you back to the game so you have to X out to play again. And no, I don't want to pay to opt out of the ads. This game ODs on ads' no need for it. Although this is a fun game, I hope they work on making the levels more challenging. I'm on Level 11 and it's no different than the previous levels which ends up just being redundant.
4 stars: Very much enjoying it. Different scenery would be nice, maybe a map to choose where you're going or want to go to. The ports you build should have something to offer once they're done maybe. Sometimes when you have to watch an ad the game comes back to a just black screen, you can hear the game but can't see it. You have to close it out then open it again. A small glitch that I'm sure can be easily fixed.
4 stars: Fun, undemanding arcade game that reminds me of the old coin-op machines with a periscope. Lovely graphics. Don't understand what the Port upgrades are for, and submarine upgrades make the game easier as you play, because scenarios don't get any harder. Essential to pay to get rid of annoying ads, and even then you may need to watch an add to, say, skip a stuck level where a target is parked behind an island - your sub can't move.
3 stars: I like the deflection shots, the smaller boats with their evasive actions, and the varying speeds when hit. I don't like that I keep getting sent to port after I've upgraded all available ports, that there is no need f