You should still review it! It would be easy to never review anything if we routinely said "I'll only review it if no one else has," or even "I'll only review it if I'm the first to feel this way about a game." That's the path that leads to eventually reviewing nothing, because there's always someone who feels similarly about a game. I'd love to see 2 or 3 reviews on the site for every worthwhile title in existence, really. There's some value in that. So I hope you'll write something up for Pushmo. It's certainly a deserving enough title, despite only being a download. (Also: thanks for reading!)
"Too often we enjoy the comfort of opinion without the discomfort of thought." - John F. Kennedy on reality
"What if everything you see is more than what you see--the person next to you is a warrior and the space that appears empty is a secret door to another world? What if something appears that shouldn't? You either dismiss it, or you accept that there is much more to the world than you think. Perhaps it really is a doorway, and if you choose to go inside, you'll find many unexpected things." - Shigeru Miyamoto on secret doors to another world