This and your second volume of songs were life savers for the Metroidvania Month submission I just finished up.
My music person let me know pretty late that they wouldn't be able to get all the music we needed done, so I had to find some nice, cohesive songs for free or have no music at all.
While my game isn't exactly Gameboy style, these fit quite nicely. Just wanted to pop in these comments to say THANK YOU for providing these great assets. You rock!