Final Boss Fight

You have spent many hours grinding this incredibly difficult platformer.
You finally finish the level and progress onto the boss fight...
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You, the player, use S and F to move, E to jump. Use Q to attack.
The boss (your friend, brother or grandma you roped into playing this) uses the arrow keys and enter/return to attack.

As you, the player, lose to the boss, you will respawn and come back stronger.
Woe to the boss, who is stuck in an endless loop of defeating players and hoping that the next isn't the one to finally defeat them.