5: Full pack of funny animals
I finally was able to play my game. I configured a whole pack of animals. Now I have grass, a bug, an African rat, an Antelope, a hyena, and a lion. I drew temporary sprites for all animals, as I wanted to have an approximate view of the final game.
I also played with the size of the game field. The 10x10 size is too spacious and makes the game session duration too long. I choose a 6x6 size and it feels like just the right vibe.