One of those "so broken I'm not even sure what was intended" kinds of levels. Very strange. Important 2 save technique. Interesting, filling holes to non exits to fill holes to the exit. Unusually I got first try, elementary maybe? Fist try, unusual for me. 20off, then 10off, then 2off for ages, it took me a while to fine tune the final few moves, nice pipelining. 
Insights