I only have 193, atm, but want to give stars cause I think this is a great level! At first it was hard for me to see, how to even keep enough blocks alive. :)
EDIT (20 minutes later): The 191 surprized me. Would not expect that to be shorter.
Looking for 294 here was GREAT FUN!
My first tries were light years away. Then I realized something and immediatelly came closer, but was still at 310+. Slowly seeing new and new ways how I can do it, I was coming closer and closer. When I got to 296, I forgot it and then found two or three 298s. After that I finally made it green, reaching the 294 path.
This was great fun. I hope it's optimal. Took me quite some time (hours, I guess) to clear it.
Cool pipelining.
Lol, there's also this thing where potentially, if the player went through levels 6,7,8 first, there is a weird dynamic / trap that really pays off here.
Insights