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Being familiar with The Incredible Machine, I picked this up to reminisce and have some fun with puzzles. Besides, a two for one!? That's great.
For me the puzzles didn't get challenging until hard difficulty. Perhaps I was younger, however, I remember The Incredible Machine puzzles being much harder. Therefore, the previous difficulties seemed to just take time to put the pieces in place.
Play time included about 8-9 hours for me to finish all the official puzzles. Played some of the Editor's Choice community mods and puzzles. There certainly is much more content if you factor in the community puzzles. However, one challenge is that the game fails to keep a progress of what community puzzles you've solved--unlike the official puzzles.
With all that said, it's a great game, and I recommend it. Perhaps a 8/10. Support the developers if you'd like to see more of these types of options.
Certainly have some fond memories of The Incredible Machine, so I'm pleased to see this released!