I actually passed on this game many times, until a friend recommended it to me. After actually looking into the game a bit more, I realized it was something that would really interest me. When I finally played it, I was pleasantly surprised.
If you like an interesting storyline following unique "characters," puzzle platforming requiring lots of planning, and witty narration (I've been told the narrator might be the same one for The Stanley Parable), then you will like this game.
The aesthetics are good - although the characters are simple shapes, the coloring and effects in the background are well-done. The music and sound effects are very nice, adding appropriate vibes to complement the pacing and atmosphere of each level. The narration is very good, and offers the backstory for the characters. If you like storytelling, you may be surprised by how attached you get to simple shapes. The story is also well-written, and each level adds a piece to the puzzle that is the main plot.
The controls are simple and easy to learn, however, mastering the game mechanics can take a while. As you progress through the story, you will meet new shapes - each with their own special ability - and you will have to use each specialty of each shape propely in order to advance to the next level. The learning curve is mostly minimal to moderate - the main difficulty being in how to solve the later puzzles in the game. Later, there are some timing-based puzzles involved. There are usually checkpoints to help you continue on if death in parts of a level is a possibility. I am currently stuck on a level that requires both timing and careful planning = it is the level where Thomas and the green shape must mirror each others paths or else one (or both of them) will "fall" to a bed of spikes and die. It's taking a while mostly because there are no checkpoints and I get impatient if I die before reaching the end portals.
For achievement hunters, this game has fairly easy achievements (most are progression-based), the hardest ones to acquire being the jump count ones; however, you will most likely get all of them through progression in the game.
The puzzles are challenging and increase in difficulty at a reasonable, fair pace. You are also (usually) shown basic concepts for what to do in easier levels before you encounter them again in subsequent levels (with more difficult puzzles). So long as you pay attention to how you are solving each puzzle, you should have little trouble solving each stage. Trial and error also helps a great deal.
Overall, the game adds a nice flavor to puzzle platforming, and projects a minimalist, serene feeling while you play. Puzzle enthusiasts should definitely give this one a try.
DJSF @DJSF's Rogue Reviews