The wine flatpak does not natively include DXVK because it doesn't behave as expected anymore. Please install DXVK using winetricks where necessary until another solution is found.

Latest Minigalaxy Dev version available in flathub-beta. To install:

$ flatpak remote-add --user flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo
$ flatpak install --user flathub-beta io.github.sharkwouter.Minigalaxy

To run:

$ flatpak run io.github.sharkwouter.Minigalaxy//beta

In some cases for Dev version due to known bug you need to install org.gnome.Platform.Compat.i386 manually:

$ flatpak install --user org.gnome.Platform.Compat.i386//45

In order to generate 32bit modules run

make