This is really well made! But reading this makes me want to add some key things you missed.
#1 - Priority
Don’t go on adding everything willy-nilly. While the rhythm (though not entirely necessary but helpful) is important, your priority should be a base! The base notes tend to be long sections of notes, usually to give a tone to the music you are creating. If you want an example of a base, go see my song Beheaded on the Free Music topic! If you want an example of NO base, go check out Happy Reset on the same topic!
#2 - Instrumentation
This one is a little bit of a suggestion since this can still be up to you for your works, but it’s as follows; Be careful on what instruments do what. The dog is an all-rounder, you can hear it almost everywhere–While instead, the Computer is much more functional away from the bottom, more useful when used at a higher pitch! Same with the kitten, the duck, the cherry, they all have unique ways they can and probably shouldn’t be used.
#3 - Backgrounds
While they are called background, some notes serve VITAL differences!! For example, the explosion is not a background, it’s a beat. Why is this important? The explosion is the only beat in this set, so it’s a very important thing to master. Take your time to learn it and you will see it’s VERY important to the song if you take your time to make sure it sounds right.
#4 - Time & Signature
Your songs don’t actually need to be mega long, in fact, most songs I’ve made for Hebes and Zombies of God barely stood past 1 minute each! They can be whatever you choose, but what can matter greatly is your balance of Time Signature. This determines how many notes can fit on one block of music. The default is 4 beats, 1 measure. You can change this to 4 beats, 3 measures to create 3/4 that fits perfectly! (Though you should just stick to 4 beats, 4 measures.)
#5 - Scale
Just for beginners, until you study things like Music Theory, PLEASE do not use any sharps or flats. If you would like your songs to have a more “evil” feel like my songs, you can look up Minor Scales, which are sets of notes that you can use to give that feeling! Using no sharps or flats and starting on C is the C Major Scale, a very easy-to-work with scale that sounds good!
Like I said, lovely work @Reflectfr! Also thanks for @randomuser for asking you to do this! Lovely work!