The Cave of Montauk seemed simple the first time, and indeed, the solution is not hard, but I wound up coming back for the graphics a lot. As part of the Adventuron Cave Jam it's about finding treasure in a cave, guarded by a troll. Getting in is not too bad--you have to figure how to get an apple from some high-up trees, and once inside, you need a light source. These puzzles string together well.
Inside there's some guesswork as to which item a statue wants, but since CoM is not a huge game, a bit of trial and error is more than okay. In fact it shows off some more nice graphics for the side rooms that ultimately don't matter.
CoM is a very safe game, and if it is not terribly ambitious, it's aesthetically pleasing and welcoming, which I think was the thrust of the Adventuron Cave Jam. Though there's no risk getting lost, I still do wish there was a bit more and that the author tackles a bigger project in the future.