Fun puzzles that gave more portal gameplay adding in water that blocked gels, difficult puzzles, and then needing to solve a puzzle that keeps getting more difficult with a time crunch at the end.

But the story started picking up, dropping a bunch of cool hints that you start to expect to see payoffs for and then all of a sudden the game ends and it was a bummer. Wish the game just had that tiny bit more to it to really tie everything together better. But oh well