Ender Games

I am currently reading the Ender Games. This book is about a group of people forced to compete for there live but it takes place in space.  I believe that this will play out a little like the Hunger Games  I believe this because it seems similar in a way. I wonder if it will be the same as the Hunger Games  I want to know why this death match is happening  in space? One thing i think will happen is that there will be alliances made and the main character will be alone and be forced into hiding. Would you form or be apart of an alliance or run alone? I wonder why this book is named closely to the Hunger Games?