itch.io

I think you can use AddmusicK SPC dumper to extract them from the romhack (but I haven't tried).

Sadly rather buggy (for example pressing start on the game over screen is a softlock) and sloppy (no d-pad support, countless inaccuracies)

Cool, but it's only 4 levels. I speedran it in 17 seconds. 

It's probably because there's no Nintendo logo on the start screen (so the license check fails). Edit /3ds/open_agb_firm/config.ini and set directBoot to true, that should skip the startup screen.

I can't download the Google play version. It says "This app is not available for your device" even though my phone is new. Would you mind uploading the apk to itch.io as well?

The last mirror puzzle is broken. The accepted solution is

11111

00110

11110

11111

01101

(the last row is the mirror of what would've been logical)