What do the symbols on the main menu mean?

If you swipe all the way to the left on the menu and then some, this sequence of symbols appears. (Do not pay any mind to the white circles: it's where I was holding my finger. The space between the first few and the last three symbols is also not present in game.)

What gives?

Solution 1:

They are the characters of the game as a symbol.

• Triangle is Trin (3)
• 6 dots in a circle is Thumbert (6)
• Maybe an up-tooth? is Treycee (12)
• I think it's a sleepy face for Tristine (24)
• Buck tooth is Torbus (48)
• The sharp teeth are Traven, the "herbivore" (96)
• Headphones for Threejay (192)

and from here it's spoilers, depending on how high you've gotten.