I named my save file "RAT", which led to some hilarious dialogues. 

I loved the variety in slider types and puzzle mechanics, and how the puzzles managed to explore mechanics thoroughly without dwelling on them, keeping only those "aha!" puzzles (the ones that appear impossible until you realize an ability you always had) and skipping the puzzles inbetween. My favorite area was the Rocket Factory, but I have fond memories in all of them. My favorite soundtrack was in the Chloro Caves.

The only problem I had was with how the dialogue works. It's so easy to accidentally skip a piece of dialogue, or miss it because the reward item spawned on me, or because certain dialogue advance on their own.