Completed the main story mode consisting of 80 levels. Very abstract like Portal and quite difficult in places - a good puzzle game. There’s a Vault section I’ve yet to complete that contains puzzles that were too difficult for the main story.
There’s a fair bit of humorous commentary (which is repetitive but can be turned off) and the credits change according to the success of the ending.
It’s currently on GP so it’s worth a look if you like puzzles.