Interesting music; the further on you play and as a side-note it gets pretty annoying when the song just loops back to the start when you die; that nearly blew it for me.
But despite it being being short I would have maybe enjoyed it more if getting to the island wasn't so hard to get to at times and maybe a add a little to the ending to make it less as I've seen in some other reviews saying it's pretty anticlimactic, for other games obviously.
Though you do say it's a test so what else would you expect; I hope you do more full-length games it this art style. Like the subliminal message by the way.