I just wanted to chime in on how much I love this game. I've always enjoyed the puzzles this was inspired by, but the combination is definitely better. I'm currently on level 93 and looking forward to having all the (curated) random levels yet to play.
Am I correct in thinking that some puzzles have multiple solutions? For instance, I've had a few levels where there's only a 2x2 space left empty, and there are two of the same shape left to place, where any configuration of them is valid.
Am I also correct in thinking that there are some times you have to guess, if you can't think ahead 4+ moves? I've worked out a lot of placement strategies, but I've had maybe 5-7 levels where I couldn't see a way to move forward without just placing something and seeing where it leads.
I do have a bug report or feature request, sort of related to that last question. The B button is supposed to be an undo, right? Shouldn't it just undo a single change? I'm always scared to use it because it doesn't seem predictable how many changes it will undo. When it undoes 4-5 changes, it can be frustrating, because it takes a while to work out the harder puzzles and I can't always remember those previous moves.