nevermind, no clue how I did it. But right the next run I did I somehow had 2 shots left to destroy the thing. But still, it is too tightly planned, could have 2 more shots to be at ease there
AND I only jsut now noticed that slider on the bottom right, (was it there before?)where you can increase the difficulty I guess.level 5 blocks sure take some hits to be destroyed! :O