You’re looking at the weird game with obscure visual style inspired by the hack’n’slash projects.
Under no external funding.

It’s a top game. It has a Steam page.

The description in if-it-was-a-AAA-project style is below:

Endless Boss Fight is an action-adventure third person game with some elements of hack ‘n’ slash.
Will you dare snatch victory from the jaws of defeat? No one knows but Her.

She knew you would come.
She studied you, your weaknesses, your obsessions. And you?
You walked straight into her trap, like a toddler.
And now she’ll do whatever to make the daylight fade for you forever. She has everything in the palm of her hand.
And you are not an exception.

Study your enemy, unravel their wills, interfere their moves.
Act faster: breath in the sweet air of victory and feel the bitter sting of defeat.

Astra will never let you go, she is just mocking you.

Astra’s strength grows with each of your victories.
Take tactical moves and choose your next step wisely if you still hope to get out of her trap…

She is treacherous, deceitful and lying. She has many aces up her sleeve.
Be attentive: maybe it’s not only about physical strength?

Face it, she is way cooler than you.
You never know where she will take you…
To the snow-covered mountains or to the burning netherworld…?

You never know what senses she will deprive you of…
Of vision? Or maybe of self-control?

She is playing with you. Will you dare win the game without rules of yours?