What starts out as a standard "move one way until you hit obstacle" quickly turns into a more interesting game with more things to think about (winds, cargo, spikes..). The introduction of new elements right in the game were well made. There is some room for input convenience: Clicking anywhere in the correct direction could get you moving, having a larger play-area (even just scaling the art up by a factor of two or three..). Your idea to use keyboardinputs is great, that would make it much more convenient.
The credits made me laugh. :)