Good job on making everything yourself, it's quite an achievement ! The axolotl is cute :)
My only tip would be to try to balance a bit more the high and low frequencies on the song, as everything is pretty high in register. You can simply try to play lower notes with the synth doing the chords, or have a lower percussive line sound, or if you can boost the lows on some tracks. This way the some sounds like the claps and melody would hit more :)
The song is quite catchy though and the energy fits the game well, good job on that
And as I said earlier doing everything yourself makes it so much harder so good job !