this is pretty good! reminds me of a good ending themes in general
my only two complaints is that i dont really like how it stays on one and only one chord progression for the entirety of the song, feels a tad bit repetitive imo
and at 1:19 ~ 1:26 those Eb notes felt a bit out of place imo, specially since the square on the background is using the E note ocasionally (on its C G E C G E sequence), so they kinda sound slightly... dissonant, i think that's the word. a bit like making a melody in a minor scale for a song in a major scale
but once again this is good, just pointing out the details i didnt really like so you can further improve on your next compositions, but you're in the right path imo so good job!