Thank you for your comment! Tbh we don't know why Unity made changes in the scene after building the project. The original canvas scale of the game was conserved, but the camera scale was cut off. so that made the game confusing for the users. It was original supposed that the menu, level 1 and level 2 would completely fit the screen and that there shouldn't be any problem :(
About the objective of the game, it was only to collect all the fruits and arrive to the trophy in order to arrive the next level :]