A very fun and addictive game, nice! 352 was my max. The procedural generation keeps it interesting and didn't produce scenarios that felt unfair, especially with some practice. It was also great that practicing the game made for better skills, higher scores, and more fun -- I always think that's a good sign for your game design.
The one difficulty I had was that when starting a new tower on an island, it sometimes would "red-out" the option and not let me build, even when there was open space, no island obstruction, etc., while at other times it would allow me to start building at the edge of a tiny bit of land, e.g., with a gap below. When it prevented me from building, the red tower would sometimes float /flicker down behind the island, if that's helpful info.
But that didn't happen too often and was a small issue in an otherwise fun and engaging game.