Plays really well 1 player, though it is hard to see the current scores because of it is black on blue, perhaps this could be altered to something more readable? Otherwise great work! :)

Managed to do it with 10 seconds remaining, very hard to maximise dropping things off, and the radioactive bits can really get in the way!

I'm always a fan of puzzle levels that provide multiple routes to complete different objects. IE; more than one way to complete it but some might become more difficult than others. Although I know this is rather hard to fit into a small level! Otherwise yours have good level of difficulty, they require some thought process, which is always good :)