Played the whole game in Coop mode, using the new two player mode which was introduced in the Nintendo Switch version. Overall I really liked this game, it was a relaxing experience to play as a couch coop. Being a 12 year old game, the visuals still look good and drag the player into this fantasy world. I find it cool that the Voice acting is a purely fictional language and the story is being told over visuals only. You progress through the levels by walking and solving different puzzles - none of them were really hard for us though, but I like that you need both brothers involved to solve them, so each player has to do something.
So why am I only giving this 3 Stars? First of all the game is very short, which itself is not a bad thing and you would think that this allows for some replay value (there are different achievements and secrets, which you could still find). However both me and my coop partner were so disappointed by the ending part of the game, that now when I know how it ends, I don't want to jump into it again.
Furthermore we encountered two game breaking glitches that stopped us from progressing. One even lead to us having to replay a whole chapter because there was no way to fix it. A quick Google search showed me that these bugs are already present for a while and I can't understand how these were not found by the developers during play testing.
Overall it was worth to play this game once, especially if you can grab it for cheap during a Sale. However keep in mind that it's not going to be a very long game and it's not a perfect coop experience.