Took me too long to realize that I was running a very outdated version of LÖVE.
Gameplay
Honestly, it's frustrating to play this game. There are a bunch of minor details that make it unpredictable, sometimes you'll land a jump on the corner of a box and die, sometimes you'll jump and a couple frames will skip, and when you flip it takes ages. Personally I think it would be better if the flips were near-instantaneous.
Graphics
Really nice, I liked the backgrounds but I think you have some parallax issues: the cacti (?) are moving at an okay rate, but the grass under the player should be moving faster, as fast as the boxes.
Audio
Soundtrack is nice, death music was only fun the first 10 times, and death sound gets a bit annoying, but again nice soundtrack. 3/5
Innovation
I dig it! I think the idea behind the game is really cool, it's just that some flaw make it unpleasant to play, but with some tweaks I'm pretty sure you have a neat concept. Keep going!
Theme interpretation
Nothing much to say, I think it fits very well.