Impressive! You've blown my life score out of the water—I'm stuck in single digits. I never thought anyone could get more than 9 lives XXXD. I'll have to fix that.
Thank you so much for giving us this great gameplay.
I took a look at this longplay and what would also make the game a bit more difficult, would be, if the color-order weren't always the same, but were randomly generated by the C64, before each level. Then the player wouldn't be able, to plan entire moves in advance, which would always play out the same way, if you played the game repeatedly. Because then you'd have to adapt your gameplay to the color-order randomly selected by the C64 each time. This could be realised by a click-function in the game-menu, that would offer a choice between "fixed color-order" and "random color-order".
This suggested "random color-order" could be realized only as a selectable function in the game-menue and the "normal color-order", which is already in the game, could stay like it is. Then users could choose, what they want and both sides (advanced players and normal players) could be satisfied. But okay, all theses things are only suggestions, of course.