x6455/Gomez- ? reverse-engineered prompt

Build me a creepy little Flutter app that feels unstable and mysterious when you run it.

I want it to look normal at first, but then sometimes show strange hidden messages, random responses, and outputs that do not always match what the user typed. It should feel like something secret is happening in the background, with a mix of ordinary screens and unsettling surprises. Keep the experience dark and eerie, maybe with a warning style landing screen, odd text, and moments where the app seems to change on its own.

Make it work across desktop and web too if you can, and use the assets already in the project if there are any. If you need to look up current docs online, go ahead. I do not need anything harmful, just the creepy vibe and the unpredictable behavior. Please make it polished enough to run, but still feel intentionally weird and a little off.