LOW_MEMORY error when loading app

Hello there!

When I upload my code from the Web IDE to the watch, it runs as expected.
https://www.espruino.com/ide/?gist=9df12­9529bccc133f9f82bf7b39de48f&upload
(shows you current time and start message, until you press button 2 which stops everything)

I am trying now to store it as an app.
The code string is big (18 156 chars), so it is split in chunks and writes gracefully in file.
https://www.espruino.com/ide/?gist=3fddc­28e3188fd5f5cded6aa1d037cb0&upload

But when I launch the app from the app launcher, I get:

Execution Interrupted during event processing.
New interpreter error: LOW_MEMORY,MEMORY

Any hints on how I could troubleshoot this?

I have LOW_MEMORY issues when reading my app from storage.
The app is quite big: the code string is 18 156 characters long.