This game has its share of issues, but I'm still recommending it because [b]the puzzles are good[/b]. Puzzles are the meat of these sorts of games, and [i]TaniNani[/i]'s are generally pretty tasty.
I'll cover the problems first. One bug I ran into, in World 12, would take me to a random puzzle in the same set (solved or unsolved), rather than the next one, if I clicked on "Continue" after solving a puzzle. I don't know if this was because I was jumping around at this point, but that's what was happening. Also, I had to reenter my sound settings upon loading up the game multiple times until it suddenly somehow remembered them.
On the non-bug end of things, I found it annoying that there was no way to go directly to a set of puzzles from the pause menu or the menu that pops up after solving a puzzle. Instead, you're brought back to the main selection screen, which means having to scroll through all the earlier worlds if you're well into the game (which can be irritating on a trackpad).
The music is tolerable up to a certain point, after which I found I had a much better time with it turned off (that's how I found out about the sound settings bug). As for the graphics, they're fine for the most part, though a little too small, especially once certain tiny elements start to come into play. The last three sets of puzzles seem to have been added after release, and don't have achievements tied to them, in case you happen to care about that sort of thing. Also, the third of these newer(?) sets is easier than one would expect, given those that come before.
Despite all of this, I am still recommending this game because, like I said, the puzzles are decent! First off, you should be aware that this is one of the harder spatial puzzle games I've played; it's not [i]Baba is You[/i] tier, but more on the same level as [i]I and Me[/i] (another game featuring puzzles where two characters have to be managed) or [i]Escape Goat[/i] (another game where good timing is frequently required). The difficulty is uneven at times-- for one thing, I think the [spoiler]wall walking/gravity switching mechanic[/spoiler] is introduced a bit too early-- but in general, the puzzles are well designed, and the bonus challenges are reasonably, well, challenging. The sound effects are pleasant as well.
So, in summary, this game has a lot of little issues, but hardcore puzzle game fans should have a good time with it. If you aren't a hardcore puzzle fan, you may enjoy it, but there are better games of this type out there.
One last note for any Mac users out there: if you haven't upgraded to Catalina, don't worry! I played the entire game in Mojave (Mac OS 10.14.6, to be exact) and it ran perfectly fine.
