Second artist here, sorry about the 5 days delay! I'll try to explain the lore and why every symbol was used.
The history circle around a family, the Dad was famous in the music world, and later at the war, he lost his beloved one and fell into despair, his child forgotten by his madness. He wanted to get back to the old days.
The Clock, the tower where time was more then a concept, break through the defense was nothing for him. He started to search for a way to control it, to maintain his sanity, he put his memory, THE TIME he spent with his family into real things, to help him and support his warped mind, even though he knows what he is doing is wrong.
The Clock was distorting everything because of the tests and poor management, someone had to do something about it, but no one had the power to challenge that tower. Maybe his son? (Who lost his memories because of the distortions, he don't remember that the Maestro is his father, or why he's there)
Well, about the symbols the one in the pendullum represents the Triskele symbol, who represents the soul-mind-body
Body-The Ballarina, pendullum part
Soul-The Musician (the 3rd boss not added), gears part
Mind-The Maestro, hours part
Every part was a essencial part for the clock to work.
And the other symbol is the Tree of Life (Caballa), that you can see at the background clock wich means maestro road to perfection, to be able to rewind the time
I wanted to add a lot more of meaning to the symbols and the history but we're focused into finished the game at time. If we continue this game, i'll add it with no doubt!