The narrator and Ms. Ibarra are well-developed characters with distinct personalities. The narrator's gradual realization of the danger he's in and Ms. Ibarra's calculated and vengeful nature are portrayed effectively.

The story is well-paced, with tension building steadily as the narrator explores Ms. Ibarra's house. The reveal of Ms. Ibarra's true intentions is well-timed, creating a sense of suspense and intrigue.

I felt your use of vivid descriptions really aided in creating a sense of atmosphere and setting. Details like the tipped-over salt shaker and the hoarder-like condition of the garage added to the overall mood of the story. By including small details like these, the scene is grounded in reality and allows the reader a more immersive reading experience.

The twist ending, where Ms. Ibarra reveals her plan and the narrator's fate is sealed, is unexpected and adds a darkly ironic twist to the story.

While Ms. Ibarra's motivations are clear, the narrator's motivations for trespassing and tampering with her property are less so. Providing more insight into the narrator's mindset and motivations could enhance the story's depth.

The story could benefit from more foreshadowing of Ms. Ibarra's true nature earlier in the narrative. This could create a greater sense of unease and anticipation leading up to the twist ending.

The dialogue between the narrator and Ms. Ibarra feels somewhat stiff and formal, particularly in the final confrontation scene. Adding more natural and believable dialogue could make the interaction between the characters more engaging.

Overall, you've created a suspenseful and well-crafted story with strong character development and a compelling narrative. With some refinement in character motivations and dialogue, it could be even more impactful. I know this originally written as a contest entry for The Writer's Cramp and was under the constraint of the prompt and word limitation. Therefore, I have only provided suggestions on improvement should you wish to explore and expand the narrative beyond the scope of a contest entry and turn it into a fully-functional and unconstrained short story.

Write on!