Nice game played it for quite some time.
The only things i would fix are:
- should add reset level button or something, the only thing u can do in case you are stuck is reload the page which starts it all over again
- the boxes push mechanism is very punishing, if u mess up even a bit and u get the box right next to a wall u're done, u can't drag it back u can only move it up and down if u're stuck on a corner.
Great job on getting it done in 7 days, you get extra points for using Haxe!!! :)
Please rate my game too :)