Nice! Managed to beat em all.
The art was nice but the perspective made it very hard to read. It happened to me several times in the early levels that I misjudged the area where I needed the boxes and was off by one in the end. Also few times missed a block completely because of the same reason. Would have been much more clear to play without the extra dimension of the blocks and everything being flat.
The gold blocks were a nice twist but on the first level they appear, they came too late at least on both of my plays so you need to do some extra shuffling of blocks around even if you manage to build it perfectly up until that point. Very disheartening.
The bad blocks on the other had seemed like a non-factor completely. Only happened to me once that they broke something and those blocks were some extra throw away thrash anyway.
The slowness was bit of an issue. So much time was just spent waiting around for the blocks to fall. I don't really see any downside of allowing the player to grab the blocks off the air too. Am I missing something? I mean, you anyway just wait for a block to fall anywhere and then you're free to position it however you want anyway.
There was like zero uses for moving the barge. On the first gold level I though finally some use had appeared and I had to manoeuvre the barge so that the incoming gold blocks would hit the stuff I had already placed on the frame. But that tactic ended up being void too since you could just grab the gold ones after they had landed and squeeze em in the frame.
But yeah, very good job! 👍