DOS/Windows swimmer metroidvania-like 90-2000

[armorking596]

Hi,
I'm searching a game for a friend, is a swimmer metroidvania-like played on windows 95 so It should be for Windows but I know he used dosbox so also DOS.

The game is presented with a swimmer main character with metroidvania elements, combat seems like 2 shot for enemies with a evil mage boss.
Seems the first level of the game because he never beat this boss, thanks for the help!