You need to goto the level select screen, and then click on the Unlockables button, a window will pop up and there will be a Ships tab that will let you change your ship.
Thank you very much! We actually have a few ideas already that we would like to do for a sequel and have been making notes of feedback and suggestions from comments.
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I at first thought this game would be fun, then I found it to be aggravating. I really think there needs to be an action/puzzle genre for games that are part action and part puzzle. Puzzle games shouldn't require precise timing and little time. Puzzle games should have infinite time and logical answers. I'm not saying your game is bad, I'm just saying it isn't really for me.
Thank you for your honest comment, we will try better to make our next games less aggravating! I agree puzzle didn't seem like quite the right category to put it in. I would have chosen "Skill" based game, but I couldn't find that as a primary category and Puzzle was the closest option I could find for the game.
We had it going chronologically at first, but the difficulty curve was too hard with winter being the second season with multiple ships, so we decided to make it progress backwards in time :D