Vil Makler: Second War

Vil Makler is the only human alive after a desperate and suicidal last space battle against aliens nicknamed Ants for their looks and behaviour.
Desiring to strike a final blow when the alien's command ship appears, he lures a scouting vessel, kills the Ants, and flies it inside the Ant ship where he detonates the warheads he took with him.

When he wakes up later without any memory of what happened and an aching body, he discovers he's in an unknown and overgrown empty city. The helpless cries of a woman get him into action against Ants who captured her but fails quickly at the attempt.

After waking up again inside a cell with the woman he learns she's a feline species and that the world he's on isn't the same Earth he came from but must be in another dimension, one where humans never existed. He also learns the advanced predator species inhabiting the planet are losing a war against the ruthlessly expanding local Ants species and that he needs to escape with her when the Ants begin their horrible examination of him as an unknown species to them.

Warning: explicit content.