VMAN
VMAN is end game content that is important to finishing the game, due to it's extreme currency buffs of x5 times to high score of course count completed. The amount of time available to the player slowly grows, encouraging players to return to it several times, and to find optimizations in course completion, out of course navigation, and course completion order.
VMAN starts the player in a meta run at the front of the game with zero upgrades or abilities. Each time a course is completed, the player has enough resources to hit all of that course's upgrades, with the ability upgrades being the only ones that matter. It resembles a boss rush in course form, with the time limit and player ability being the two primary roadblocks to advancing.
After the time runs out, the player returns to where they were, with abilities and unlocks returned, and their resources grown by the amount of time that passed while inside VMAN. A practice mode is also available, giving as much time as one wishes to navigate the run.
The game mode doesn't care which courses you complete, provided that the total number of courses is more then it was previously, a higher reward tier is earned.
Spoilers
Completing all 10 courses is possible, but very difficult. Cutting out courses to get to the fake credits quicker gets you automatically upgraded to 10 courses complete. If you get to the fake credits in practice, the monitors remain blank. Access to c11-c15 is possible, but they don't interact with the player.
Even Deeper Spoilers
See the commented out message in the edit of this page.
ToDo: Where and how much the +120 second upgrades are. The omni at start of run upgrade. Trivia about the reference VMAN is to. Fact check the "resources grown by the amount of time that passed while inside VMAN." part (pretty sure it is true, but not positive)