Yes, really nice and tricky levels! I've solved the third only cheating (time limit set to off ) Well done, Springli!
Note to level 3: there are two ways to pass from one section to the other: the obvious one is to wait until a Dark Yam frees the space on the other side, the other is to keep pushing while a Mole is passing by, so that you are allowed to enter the door (but not to pass through), there you drop a bomb that frees three tiles to let you pass - well, it needs a good timing, but that's the fun!