Suggest improvements in my snap's .yaml file

Hey there, Here’s my snapcraft.yaml file:

name: readaratus version: ‘2.1’ summary: A dynamic book reading system for computers license: GPL-3.0+ grade: stable description: base: core18 confinement: strict

slots: dbus-daemon: interface: dbus bus: session name: org.readaratus.decoder

parts: readaratus: plugin: dump source: https://github.com/rezahsnz/readaratus/releases/download/v2.1/readaratus-$SNAPCRAFT_PROJECT_VERSION-64bit-Linux.tar.gz stage-packages: [libpoppler-glib8]

apps: readaratus: command: readaratus extensions: [gnome-3-28] slots: [dbus-daemon] plugs: - home - desktop - desktop-legacy - wayland - unity7

Since I am new to snapping, I do not fully understand its inner workings and I hope to get some help. I am specially interested in decreasing my snap’s download size which is around 8MB while my application is only 300KB. My app is basically an Ebook reader based on Gtk3 and Poppler-glib. Please take some time and feel free in suggesting any improvements that you think is necessary.