Intro Theme wastes no time in establishing the genre, and this might (surprisingly) be the first submission I've come across that is pure chiptune. Loving the various use of oldschool techniques here to really get the most out of each wave and channel.
Overworld Day has some delicious oldschool percussion - who knew noise could be so groovy? Melodies here are delightful and play off of one another really nice. More examples of good usage of the likes of vibrato and automation to squeeze every last drop of usability out of the waves.
Overworld Night plays with some lovely contrast in comparison to day theme. An almost lazy sounding rhythm at the beginning that soon gives way to some busier work, but without fringing into the "upbeat" territory. I wouldn't say there are "lullaby" vibes to this, but it captures that drowsy feeling perfectly.
The Date comes in with a surprise - I was not expecting that intro. It feels somewhat tense in the beginning, leaning heavily into the significance of the title of the track. In typical fashion, it opens up later and features some really nice ear candy. Playful and catchy melodies in this one.
Finally, Ending plays to all of the strengths of 8-bit. I feel like I could envision this track in particular fitting into so many games of that era, to the point where I feel as though you could just drop it into any game and not realize it wasn't "meant" to be there. Great way to round out the soundtrack.
Great work - first proper chiptune submission I've come across, and it was a delight to listen to. Brought me back. Best of luck!