Ye, the lagg is inevitable because of the amount of particles. You can just delete some, but I think it's more spectacular the more particles there is.
I found a gold, but how the *** do I get up to the end? Really fun game anyway. I think the blob should somehow be able to die, makes it more exciting.
I'm glad you liked it. I've started working on a second level. The new level is more about technique then brains. You'll probably see it here in a day or two.