I think you're right about level 2, that initial challenge is apparently tricky enough for most and sounds like a lot of people are still giving up on level 2.
The duck solution is genius! I never actually considered doing that but I thinks that's actually more elegant than the intended way, which is to pause the game right as you respawn just above the ground, then simply walk over. With the duck method you don't need to time it!
Level 4 - good shout on starting with a medium size duck, I'll make that change.
I actually didn't realise that you could get the bug on level 4 that way! I tried to make it so that you couldn't do that actually but I didn't test it enough clearly 😄. The intended way is to push the duck when it's tiny through the tiny hole in the back wall that's initially concealed by the small cube. To help with this you can use the small cube to push it. (It's fiddly)
But once it's through the tiny hole you can scale it up and it will push the cube holding the bug to an accessible point. Perhaps too fiddly, but it is a golden bug so not such a bother. I'll probably still try and improve it though.
Thanks again for the critique!