That was fun ! A bit unfair as it was sometimes impossible, or really really hard to dodge cactuses and the moving thing (I don't know the word in english for that, sorry haha), but it was working well and the day/night cycle is cool.
The particles behind the character were strange, since he's always running they never stop, and thus they do not put the emphasis on anything special as particles should. You could add particles on the ground when jumping and landing, and most importantly, when taking damage.
Also a bit of screenshake would have make it more enjoyable and juicy !