That gave me a thought around branding. The name ("Adrift") and the tagline ("A puzzle game in worlds of whimsy") both feel whimsical and fun - which is great for a game. But I wonder if focusing the branding around "brain training" might help expand your target market.
Most games are fun time-wasters, and tend to appeal to people who want to have fun and/or kill time. This game has a considerably wider appeal: it can help people exercise their brains, especially older people who want to keep their minds active. This is why a lot of people do Sudoku and crossword puzzles: http://healthland.time.com/2012/01/24/use-it-or-lose-it-keep...
I had a brain injury a decade or so ago, and the doctors told me to do certain puzzles to keep my brain active. It gave my brain a workout, and I was reminded of that feeling when I played your game.
One way to expand the target market might be to eventually do an expansion set called "Adrift: Brain Island" or something? You could target PR to the demos that brain workouts could appeal to.
Good luck!!