[TOMT] Looking for an old flash game

Looking for an old Flash game, played around 2000-2008

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Genre: Hack and slash / action RPG, linear campaign with few side ways like dojo to fight master for cash to learn something or shop

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Art style: 2D, cartoony/drawn (not anime, not pixel art, maybe bit chibi), but the violence/gore was brutal (100% during the 1v1 with the developer)

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Setting: Possibly medieval/medieval-Japan inspired.

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Gameplay: 2D with a pseudo-ground/depth plane — moving up/down on screen moved your character farther back or closer (depth effect), left/right was lateral movement. Hack and slash combat with multiple weapon types to choose from (swords, katanas, spears, club).

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Character select: At the main menu, after selecting the campaign/1v1 you picked your character from a roster.

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Enemies: Humans, zombies, summoners, animals, giant version of the basic enemies, etc.

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Difficulty/lives: Possibly had to restart from the beginning after dying too many times.

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Secret/unlockable content: There was a 1v1 boss fight against what seemed to be the game's developer — this character had a real human head/face (looked like it was made from a photo/Google Images, cut out and pasted onto a drawn cartoon body), made exaggerated faces, and the fight had a metal/rock soundtrack. Beating this boss unlocked the developer as a playable character in the campaign.