Music weeklies challenge is an open composer community that creates weekly challenges for composers to submit and feedback work on.
One of the weekly challenge themes was SHMUPS, and the result is this DLC Music pack that contains 52 free tracks you can use in your game!

A huge thanks to all composers having contributed to this pack, and especially to Scowsh who organized the music weekly challenge.

You are free to use those tracks in your own game: the only thing you have to do is credit the track composer in your product.

Installation:

Once downloaded, the 3 music packs will be added to the SHMUP Creator extensions.
But you will also be able to copy manually each track to your project Assets directory.
The Packs will be located there:
C:\Program Files (x86)\Steam\steamapps\common\SHMUP Creator\Extensions

This DLC is composed of 3 parts:

Heaven
A full 14-track album from Ed Tremblay from Bullet Heaven

The Exquisite Bullet-Hell Fantasy of Magic War
A full 15-track album from Adigun Azikiwe Polack

23 individual tracks from various composers
Adel Almas - Blow It Out
Adel Almas - Through the Stronghold
Albitrary - All Shmupped Up and No Place to Go
Albitrary - Shmuppin' Boss
Clement Panchout - Hard & Nasty (Loop)
Cybershroom - Nova Vista
Cybershroom - Ominous Caverns
FluorescentDuck - On Cosmic Wings
Jeremy Mersereau - Final Boss space camp
Kollumos - Soaring
Maned Wolf - Escape!
Marumellon - GB BossBattle
Michael Macasiano - Electric skyline
Michel Debois - Master of Shmuppets
Peter Hawkey - Overdrive
R.B.Rigid - Boss - Vortex
R.B.Rigid - Stage - Aero Storm
RiffMason (Lucas Busetto) - Hypertension
Sam Lasky - LastKeyMusic - Machinegun Madness
Scowsh - Stage Boss (or Game Trailer) Track - Loopable
Steven Joseph (3rd Echo Sounds) - Winged Hero
Tarkus1971 - Hyperchase of Venus
Zac Webster - Banana SHMUP

Thanks again to every composer and their generosity!