I managed to find all the souvenirs. The game is really cool visually, but some sound would be nice. Once I knew that the souvenirs were hidden words, it wasn't too difficult to find most of them. Figuring out what a lot of the words say wasn't too difficult, however, some had letters that were hard to tell they were part of the word, or letters that were hard to tell what they were. It might need to be made more clear to the player that they're looking for hidden words in the first place.
The cloud was a particularly difficult one, as I only found it after I realized I was one word short, and it took me forever to figure out what it said because of how indistinct the letters were. (And I have no idea what a "cigal" is)
That being said, I found this game enjoyable, especially the hidden word aspect of it. I do wish there was some sort of reward for actually finding everything though. I also managed to get stuck by the mailbox when looking for souvenirs on my first playthrough and had to reset.