Hi @Alessandro_S, thank you very much for posting this but not all players have a full set of boosters to add to the game at the beginning. When videos are created they are always done NO boosters as I can see when doing a Google search for a specific level. So as helpful as your print screens are, I think the studio still needs to be informed about "tweaking" it a bit.
@Elsa : those boosters are part of the Build-a-Bot or similar challenges, available practically always.
If you have an "unpassable" level such as 1937, all you have to do is replay level 1 eight times (or so) to fill up the boosters like those I used, then pass the level (a hard one) fairly easily.
My humble opinion is those 5 minutes spent refilling boosters for free deny the need to nerf the level... of course I won't complain if the Studio accepts to make things even easier to players
I see your point of view but not everyone knows to scroll back down to level 1 to build up free boosters. Now that you wrote this they might just try that too!