I really loved the concept of this game, and got so into it that I forgot the time. I liked the art, the title screen was very cute and the in-game graphics were easily readable (eg this island has wood, this island has gold, etc). The text for the upgrades was a bit small but to be honest I didn't really notice since the upgrade buttons have a big icon for whatever it's upgrading, so that was fine. I had a ton of fun with the gameplay itself, and thought the controls worked well. Maybe my one quibble is that the ocean could use more textures like waves etc to give more of an impression of movement, since sometimes I couldn't tell if I was dead in the water or if I was actually drifting in a certain direction. Otherwise really great job and I had a blast!
By the way, we played your game on our stream last night!