Very cool puzzle mechanic and nicely incorporated into the story. Obviously more levels would be great and currently some levels can be finessed so level design needs a bit of work.
Music and sound design compliments the game nicely.
Also I found that if both of the characters are stood on a barrel in the water then sometimes one of them would glitch out a bit.
The text on the top of the screen doesn't really pull my attention, maybe anchoring it to the player, or to find some other way to display it, because right now it gets a bit lost in the game.
All in all its a game that I would really like to see developed further.
8/10 on my scale