Thanks!
Basically, every time you scale a platform up or down = totem (your only exit) comes down a little bit . If you scale up /down too many times (e.g. more than 2 in the case of level 2 ) the totem will get scaled down so much that its exit will be below the ground level, i.e. you will be stuck hence the restart level message.
In the gameplay walkthrough video (0:06) you can see how the level 2 can be passed: