I was able to avoid the resolution errors most commentors had and had a nice time playing this game. Throwing boxes around and hearing the thudding noises they make as you do is inherently kind of fun. I'd say this has potential to be a short and sweet game. The achievements give you something to look forward to despite the game's simple premise.
I will say that I wished the phone came up at the start of the game, because I didn't notice I even had it until I had already made a few mistakes. The bottom conveyor is also unfortunately unreliable - I only stopped playing once it froze up completely and I could no longer send boxes through.