Issues in Web Mobile export of my app

Hello!

I’m working on a web version of my app, which I created with CC 2.4.5 – here is the current state:

https://app.escape-team.com

These issues are what I’m facing:

The audio is jarred and overdriven in the beginning, it seems to be set to an extremely high volume level. My source MP3 and WAV files are not. It works fine on native.

The music sometimes does not work. Some audio effects do not seem to be played, too.

When entering a code in the game, an error is shown that I dont’ know how to interpret:

IndexSizeError: The index is not in the allowed range.

This might be related to some alpha overlay? (The mobile-web export’s screen stays black for a while after entering numbers and hitting ‘OK’, which is not the case in the native apps.?)

Any help is appreciated! Thank you!
Fabian