This version is actually slightly preferable to the Vol. 2 version, as the blocks get in the way of each other in a slightly more interesting manner, but the same compliments and criticisms apply to both as they are essentially the same level.
The middle left and lower left are underutilized, and the top right is somewhat interesting but could be developed more. I agree with david that the mechanism in the top middle/top left is definitely something you should play with more. Very cool.
Having found your 177 first, I think there's only a single block here that isn't working as intended, and it's an interesting enough cut that I feel it adds to the level, rather than detracting from it. Overall, this is very fun, and a level to be proud of.