Nice update, the 2 new levels each have a nice conept!
I feel that level 2 didn't need the jump off & pause mid-fall to reach the folder though. Figuring out that you can walk over the gap was enough for me. For controls, it would have been really nice to see the camera move while the game was paused rather than it snap to the player on unpause. And for the bug, was the intended way to get it to respawn on the duck?
As for the level 4, the code gives a nice hint on the spin but if you spin the wrong way, the duck doesn't get bigger (I guess there's a clamp), so it feels like the wrong solution. Maybe having it start at medium size would solve that? For the rest, I had a hard time getting the duck as a small size up the ramp & getting it as a medium size as a bridge for the bug. I feel that the duck-shape isn't pratical. It's funny for sure but I would have prefered a block or a cylinder for that level.
Side-note, It considered I already gotten the bugs at first since I completed all the original levels. I had to go in the Windows registry to delete the unity's player pref so I could properly unlock them.
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!