This game is amazing! Much better than many official games. I especially recommend it for fans of the first Digimon World, as it captures the essence of that game and adds a lot of original content. I didn't try the first game because I didn't know it, but I really enjoyed this one on my Android.
The only downside is that you have to grind a lot and that there is no Bearmon or BanchoLeomon (my favorite digimons) haha