Like a 2D version of The Witness, Taiji deeply explores the various puzzle rules deeply and fully. This is a great experience for puzzle fans!

Most logic puzzle games are just more complex versions of already-existing, more simplistic games (like how Baba Is You is a more complex version of Sokoban puzzles, and Tametsi is a more complex version of Minesweeper). The Witness essentially invented its own type of logic puzzle (as far as I know) and took it to its limit.

So, Taiji is another version of the logic puzzle type that The Witness created. Instead of drawing lines on a grid you are shading boxes in a grid, which allows for some new types of mechanics. Each puzzle type has a section that functions as a tutorial but sometimes these tutorial sections are hard to find; there were at least 2 areas where I completed the more complex parts before I even saw the tutorial section.
The puzzles are hard but doable. I got annoyed and stuck at times but never enough to stop me from playing.

The Witness pushes its mechanics as far and as creatively as possible, but Taiji doesn't do quite as well. It is still a great game though. The most that Taiji pushes itself is in the areas where your solution moves pieces of the environment, and at the end where the same solution has to apply to multiple different grids. It never reaches the heights of The Witness's environmental puzzles.

One of my favorite games of all time. Hard puzzles with a good learning curve, although one area and the true ending is way too unintuitive