Summation Serpent head now charges the player when no more segments are to be cleared
can be stunned by clearing the number that breaks off the serpent
Factorial Factory now spawns smaller and much slower factorials on the last two phases
Added two more upgrades to basic division (start with /5 and start with /10)
"Start with"-values can now be adjusted in the loadout if unlocked via upgrades
Map selection boxes now show the highest achieved grade
