Mech Revenant: Input One

Your body has been destroyed and your mech is heavily damaged. But your assistant AI, barely keeping you alive in a coma, devises a way for you to control your your mech with a single binary input. Press (space) to finish your mission.
Made in 48 hours for GMTK Jam 2019. The theme was "only one" so the goal here was to make a full 2d action move set controlled with only one button. The entire game art is also made from only one sprite, but with some liberties taken in how it is fed into the game.
 

And finally the game has only one enemy that follows you through the three zones,
a continuous boss fight that was supposed to evolve over the course of the game.

Controls and guide (mild spoilers):

Tap (Space) x1: Short dash

Tap (Space) x2: Long dash

(you are invincible while dashing)

Tap (Space)x1 and hold: Deploy shield

(blocks projectiles, but will not protect against enemy beams)

Tap (Space)x2 and hold: Ready jet jump, release (Space) to jump

(combine with dash to traverse obstacles)

Tap (Space)x3 and hold: Aim railgun, release (Space) to fire

(will stun enemy for a couple seconds)