I moved to Arduboy2 library and gained 1KB extra.
So I added more life to the game, just like the original ZX Spectrum game.
You can find the video here: https://www.youtube.com/watch?v=7lLJJeGg3e8
You can find the Arduboy format here: https://github.com/JacosteCode/ArduIndy/blob/master/ArduIndy.arduboy
You can find the code here: https://github.com/JacosteCode/ArduIndy/blob/master/ArduIndy_2_00.ino
I hope you enjoy the game... Cheers Jacoste