A superbly-designed set of three-dimensional sokoban puzzles, wherein you must flip, turn, and nudge pipe parts into completed aquatic routes, while allowing your player character to still exit the vicinity without ruining anything. If I can nitpick, the arrangement of the puzzles does not follow a typical difficulty curve at all - in many cases the new mechanics and gimmicks introduced in the later stages (and more heavily featured in the "Hard" and "Expert" stages) were easier to comprehend than the basics of flipping and rotating those pipes in tight spaces.

Pipe Push Paradise also appears to be shooting for something a la A Good Snowman... with its closed-garden-open-world design, but outside of the very satisfying finale, it's not really explored. The strict tropexotica theming is also pretty passe, and talking to folks is usually completely uneventful. In general a feeling of progress beyond the completion ratio increasing was sorely lacking. My final solved puzzles before the (wonderful!) conclusion were in "worlds" 4 and 2 of 5, respectively.

These minor confusions compound to detract from an otherwise extremely challenging and rewarding traditional puzzler.

This game has an odd difficulty curve, and unfortunately the area right after the intro area is filled with some of the hardest challenges in the game (actually i'm not totally sure about this because this is just how i played. never saw any sort of indication of areas gated based on completion though). You're not at all required to beat each area completely before you move on, but it might be wise to if you're stuck.

Twisting + pushing puzzles like PPP and Steven's Sausage Roll can easily get overwhelmingly difficult and I think a lot of that is just locking 3D motion to a weird layered 2D grid. PPP handled this pretty well but there were moments when the forced eagle-eye camera angle made it difficult to see what was positioned where.

Like someone else said here, once I was done with the main island, I was happy to leave it there. Each of the 5 or 6 main areas have a cool mechanic and the last puzzle was a really fun big finale.