You should've gotten a briefing about the intake that states that you need to develop a game for the interview. This game doesn't have to be good, or even functional, but it should be an example of your motivation and passion for creative technology. Show off your skills, intuition, and problem solving ability with a small game that fits the requirements, and document its process! Together with this intake assignment, and a small portfolio of all creative projects you've had (and with all I mean ALL projects. I literally had a folder of a bunch of sketches I did in middle school + a few pixel artworks)
Good luck with your intake assignment! If you have trouble or more questions, you could also chat with us on the Open Day discord server! https://discord.gg/JTx8pdT