Quite a fun little basic logic game. The rules are very simple, but there's a lot of depth hiding beneath to either learn or discover for yourself.
There are a total of 100 levels that progressively get harder, and the achievements unlock every 10 levels. If you get stuck, there is a "show mistake" button which you can abuse to slowly solve the whole puzzle if you are inclined.
It took me around 7-8 hours, so this isn't the type of game that you can rush through for easy achievements. Even if there was a guide, it would still probably take a while to complete.
If you're like me and you like minimalist puzzle games which you can do while you listen to podcasts, then I definitely recommend that you pick this one up.
4.5