After noticing a flaw in our game design, in that the hitbox of the structure is too small, leading players to miss the hitbox and thus not being able to finish them, we fixed this by making the hitbox larger, creating a 1x1x1 meter cube around each structure in which you can click to add a Material.
This served as a lesson in intuitive game design, as it showed how unintuitive game design can lead to Players being stuck and losing interest in the game.
As a side note, we will soon add a russian translation of the game, but it didn't make this update, as the game still has problems displaying cyrillic letters.