I think the levels feel great - the art is beautiful, the audio is effective and not distracting, and the animation certainly brings Bob to life. I think the intro story is also the perfect length and sets the scene well.
I suppose feedback on puzzle games is tricky, because if the players don't solve the puzzles, they may mistakenly blame it on aspects of the game - but at the same time, the inner logic of the game should be clear enough to the player in order for them to feel like they have agency. I couldn't figure out how to pick up the crowbar - I must have clicked on it dozens of times, both while far from it, and right next to it. Eventually it did just show up in my inventory, but I didn't notice that I'd done anything differently. In the third room, I tried clicking on the monster (the crowbar said it was "good for hitting people on the head"), to no avail. Maybe I was supposed to shock the monster with the electrical sparks?
Anyhoo, I'm done rambling. I did enjoy my three playthroughs, but ultimately frustration won out.