2,042,360 (edit: I was one million wrong on my first post!)
The game roll over after 999,999. I rolled over 2 times.
I could have played this forever. I still had 4 lives left when I quit.
Screen before my second rollover:
The scenes also roll over after scene 99 to scene 0:
My final screen (the game glitched from scene 66 to scene 8 :