I've gone back and fixed the game. Thanks for the report! It should be playable now on most devices regardless of resolution, unless your device is extremely small.
I've been really enjoying the game, but I've noticed a few things. There are some ships that are glitched and don't take damage as well as being able to go through them. That's not a big deal though. One big issue I found was that I think an island can become invisible and invulnerable to damage because I have been shot by multiple massive cannons from nowhere and instantly died with lower-level ships. Also, the islands can still shoot after being destroyed which can kill you after a well-fought battle :/ Besides those issues, I absolutely love the game. But I think the submarine should get a buff it's pretty useless at the moment.