I wouldn’t recommend starting to do that type of game with Kodular. You see, Kodular and all branches of App Inventor are not the right platform to make complex games. By complex, it means with lots of independent moving objects at the same time. The games I made (Koduloid and Hackanoid later) are remakes of an original game from the 80’s Arkanoid. I started studying the original and seeing if Kodular was able to handle the maximum amount of sprites I needed to have moving at the same time. I found out I only needed a maximum of 7 sprites moving at the same time (the pad, 3 balls, 2 enemies and one falling power up). Most of the times is less. So that is possible with Kodular. Notice the original game has 3 enemies. So I even had to reduce it to two to keep things moving smoothly. Then all the other sprites like the bricks, the borders, the little doors that open and close to let the enemies out are all static. That’s why this game was possible to make in Kodular, mostly because almost all of the sprites doesn’t require to move.
So if you are planning on making a game in Kodular, I would suggest you to think of a game that can be done with, may be up to 10 sprites moving at the same time, and the rest can be all static. I know there’s a lot of very good things you can do with that. But unfortunately Zuma is not something I would try. Is too complex for this platform.