It was a 2D platformer, made sometime in the 2010s.

The main character was a penguin, who used an orange sword and a blue cybernetic boomerang as weapons.

In the description, the game was called "retro" or "retro-styled", and it looked like a cross between Mega Man X and Final Ninja Zero by Nitrome.

The game I'm looking for was probably not made by Nitrome.

The first level/tutorial was called "Like You Just Woke Up".