This is a good game; It’s easy, no ads, and the game-play is what you expect. There need to be a lot more levels, however, to keep people from deleting this app once they’ve completed the levels available. There also need to be more challenges - just directing the torpedoes through the water and avoiding mines is getting old.
Don’t be fooled; this game has an endless number of “levels” but it’s just the same 20 levels repeating.
Conclusion: At this point, it’s really just a fun time-killer. Not challenging and not enough variation in game play.
UPDATE: They just released a new version that allows you to control the submarine instead of the torpedo. They also added the element of the ships firing back at you so there’s some actual gameplay now. Much better!