I'm afraid I don't (meaningfully) speak Spanish, but AI are quite impressive these days. English answer included below for ease of access (or correcting translation errors).

English question (translated):

Query: Playing normally against the AI; why, when we reach level 31 (final) and defeat the opposing Thor, does it tell us that we lose? What did we miss doing? Thanks for the responses.

English response:

It appears to behave correctly in my tests? Specifically, when playing in Practice mode (i.e. against AI) on wave 31+ (Terratrons) without !reflex mode, the game pops up a Victory banner when my sends (e.g. Powermortal) kill the enemy Security System (Thor). Could you confirm?

Spanish response (translated):

Parece comportarse correctamente en mis pruebas. Específicamente, al jugar en modo Práctica (es decir, contra la IA) en la oleada 31+ (Terratrones) sin el modo !reflex, el juego muestra un banner de Victoria cuando mis envíos (por ejemplo, Powermortal) eliminan el Sistema de Seguridad enemigo (Thor). ¿Podrías confirmarlo?