Torus Trooper

Basics
You start with a couple minutes on the timer. When this timer reaches zero, the game is over. There are no continues, but there is a level select on the main menu allowing you to start on any level up to the furthest one you've gotten to on that difficulty setting.

Getting hit reduces time remaining by 15 seconds, slows you down, and resets the spread on your main shot.
Boss destruction grants on average about 30 seconds but can give as much as 45
Hitting point goals is 15 seconds each.

Up and down will control how fast or slow you are going. Theres a speedometer in the bottom right but it doesn't really matter too much, its stylish though.
Button 1 (Z on keyboard) will shoot your main shot. It starts as a narrow straight shot but turns into a wider shot as you continue. Resets to straight briefly on player hit.
Button 2 (X on keyboard) is what I call "Friction Shot"/"Brake Shot". It slows you down but charges a powerful piercing attack with good coverage in front of you.
P pauses the game on the spot. ESC stops the game and exits to the main menu, and quits if pressed on the main menu.

Braking, scoring, and you: un torusing the trooper

The scoring revolves around the braking subshot. When unleashed the shot will destroy all bullets and enemies in its path, with each bullet cancelled and enemy hit during a shot increasing a multiplier, raising the point values of subsequent hits in a chain. So if you hit a line of bullets with an enemy at the end and the middle, the bullets up to the middle enemy will increase multiplier for that enemy and everything beyond, meaning the more you destroy the more score you get. Multiplier is not persistent and only applies for a singular charge shot. A counter counting down underneath your score in the top right will show how many points are left to the next time extend. Timing your charge shots to sweep up lots of bullets and enemies in one shot can get you juicy amounts of score. Look out for big enemies shooting dense clouds and try to catch the cloud and the enemy in the same shot for big points.

The Enemy Counter

In the bottom left is a counter arranged as "enemies killed total"/Enemies left in this section. You need to kill 99 enemies to summon the boss, then kill the boss for the 100th enemy to finish the section.

So is the main shot useless? and conclusion

I usually use the main shot to take care of enemies that I didnt charge kill or that got close enough to stop firing, since even the small fry get dangerous later into a run (firing upwards of four or five bullets in a burst at some points, which is good for score but scary as hell for survival), and every enemy counts towards the section end goal, no matter if charge kill or normal shot. Speed is important, I usually try to keep the throttle maxed out as much as possible, using the brake to help manage the speed instead of turning it down. The hitbox seems small so dont be suprised if you make some really tight emergency dodges. Getting hit isnt too much of a big deal unless your timer is low or you get hit multiple times in a shortish period.