For me it is easy to get red times on Circle game but it feels like reward for remembering combinations B-)
The hardest red times for me:
On the first page: The bottom one. This is the hardest of them all.
On the second page: all hearts and sequence games. Hearts are painfully hard.
Cut down to 6 buttons is good idea.
I got all lights three or four times because of many restarts. I tried to get easy from the start.