Nice and fun, using the colors of the GWJ logo was a nice touch.
I feel the controls where a little confusing regarding the resize of the player.
For a more simple approach, I suggest you to look into some mario bros games, where different mushrooms are used: one can make you smaller and the other bigger, there is also the Alice in wonderland story example.
You could follow a similar pattern of this example and make different triangles for different sizes without the need for the player to press "e".
But that's just my opinion an suggestions. :p Anyway is nice concept, well done. :)