I started this game last year. Then I stopped, I struggled with the sprites. Now I made it to finish. The problem I was struggling was the thing with the sprites ID. I have made this game with App Game Kit. There every sprite has a Image ID and a sprite ID. The image ID is the number which loads the sprite in the RAM. This is enough for each sprite to do one time. And the sprite ID is the number, how often it appears. Each sprite comes several times.
max. sprite IDs = 273
max. image IDs = 57