Write up your project and get a free Espruino! (2021)

This can't be a project for the bangle.js can it?

It is fine - as long as it's all nicely documented. Something like an app and a few lines of description wouldn't qualify, but if there's enough documentation that someone could get a Bangle and either:

• Write their own simple version of your app
  
• Install your app and do something interesting/useful with it
  
• Do something useful with existing apps (eg. record GPS data, export/import it somewhere interesting)
  
  

Then it's fine.

I just want to avoid stuff that's basically just "1. Install my app, 2. Press some buttons".

Hope that makes sense - but please ask if you've got something specific in mind!