I think there is a couple variants that may be cool to implement to avoid problem that you mentioned:
- sort numerically (but it makes 8-directional card that always blocks the last slot a lot worse)
- value assigned to the button instead of the slot as 9 is maximum number
- add rewind button (just now thought of it).
if i come back to this game, i'll definetly implement some of those.
anyhow, thank you very much for playing my game, glad you liked it!!!