Hint, sort of: The core aerodynamics subsystem is being spun off into its own unlockable system. It has two entirely new subsystems: one for increasing the maximum flight velocity, and one for changing direction while falling without using the thrusters. You’ll need to invest into reducing drag again, because the unlock costs have changed. You’ll find gliding very useful on all worlds, especially the two new ones coming in Side D. The entire expansion is a literal game changer that I wish could have been included upon release!