Cool game!
I liked the mechanic that you had to press CTRL to reduce the darkness from consuming while defeating enemies.
However, i feel like the game's mechanics are spammable without downsides.
For example, the CTRL button could have a delay to when the player is able to attack again, like 1 second or 2 seconds, preventing him from being able to spam CTRL to being in a safe ish position to shockwave the darkness.
Still, nice game.