Leroux: Well, what is it about these games that you love? What's the common denominator? I don't know Morphopolis (and at the moment the website seems down for me), but from what I see those you list are more or less non-verbal puzzle adventures - is that what you're after? Because then some of the other suggestions like Inner World might be too chatty for you? Many other p&c adventures have a stronger focus on conversations.
Puzzle Agent is more like Professor Layton than Machinarium, most of the puzzles aren't really environmental puzzles like in the Amanita games, they're "puzzle book" puzzles inserted into a story that would probably work without them most of the time. If that doesn't bother you, you might also like Lume, but it's very short.
Incredipede is non-verbal but not really an adventure game, just a simple physics puzzle / platformer divided into short one-screen levels, in which you have to collect fruit before reaching the finish line. There's not much story to it.
I tried to keep my initial suggestions limited to non-verbal point-and-click adventures (and Incredipede, which I immediately disclaimed as not a point-and-click, albeit similar in... aesthetic, I guess? to the Amanita games), then I added The Neverhood, which I honestly think still fits whatever sub-genre I made up in my mind, but I think we're now past that and just suggesting and sharing games we like. :-P
