Update: Once I completed the game, the game awarded me with another tool. I started a new game, and had the new tool to use. It allowed me to find several new rooms and another new tool--which I don't know what to do with yet.
I think you could enjoy this game over and over, because there's something new when you replay. In fact, the 2nd time around is more fun, because I know my way around the entire ship now.
I have now finished HARD mode. The only real difference is that your inventory only has 3 slots, so you have to manage your tools a bit better.
I still have not been able to make the memory recorder, or discover Robbie's secret. You do not have to complete those to complete the game, though. Those are only for badges (achievements).
(End of update)
I found this game because I was looking for escape games. I would categorize this as an adventure game for sure. It has a plot, and an entire spaceship to explore. I almost didn't buy the whole version. What sold me was the absolutely adorable little robot.
This game is not easy, even on easy mode. It doesn't hold your hand or give hints. YOU have to explore and discover. But it can be done. And you will LOVE it, if you have patience and persevere.
I am going to play again in hopes of earning some of the badges (achievements) available. I think I'll stay on easy mode though.