ok, feedback! (couch this however you want, just want to give you some critique).
there doesn't seem like a bunch of space for meaningful decisions in the game. Since most of the pickups have physics attached to them, it is difficult to intentionally place things, and since you can't reorder your inventory, you might as well just be given a bunch of random drops up front. Two ways to deal with this that I can think of: make the pickups not bounce around, and in fact just have one pickup. If you had more than one pickup, things that interact in the explosion phase would be pretty amazing. This may have been in the game already, and I didn't notice it, but what I could tell is that most of the pickups effected the countdown phase. this game seems like it would be more interesting if it was a multiplayer version of every extend, where there was some danger and risk to tightening up your placement too much, because another player could steal it from you.
Also (and I know this is from the LD theme, so feel free to ignore) the time limit is working against it. If there was some hidden bidding process to ending the game (like two players need to press a secondary button), then I think that interesting strategies could emerge.