1. Do I only have to choose one of the characters, or am I free to choose all 4 for the game? I say this because I don't see a specification about that and I find it difficult to draw characters apart

2. The game must be in English, or can I use another language? In my case, Spanish

1. You can use as many or as few of the characters as you want! You can make your own sprites, mix these sprites with new ones, etc. There's no limit.

2. You can create the game in whatever language you want! I would appreciate an english version so I can read it, but i understand if its not possible.