Solid demo, real problem. Try to think about how to actually transform how people share contacts. You basically took business cards and digitized them...so really the only pain point you solved was data entry and not having to carry around paper. I would encourage you to think about what contact sharing would look like now that we all have mobile phones.

Intro was too long. Some minor teamwork communication issues.. this is potentially a HUGE undertaking. Difficulty to show much during a 24 hour dev phase / 2 min demo. Others have tried to do this, why would you succeed instead? What is your motivation for doing this.

To many steps, think to simplify sharing process.

Seems like it would be a good add-on for an app with an existing user base

its a real problem which many have tried to solve, like NFC, but it is difficult to see a monetary value.

Like bump, but with QR codes. Not convinced this is a usable product.

Not an easier solution, seems like it takes more work to do than just handing a business card. Didn't talk about how it would be done if the other person doesn't have the app.

It seem like a lot of work for exchanging contact information.