Wow. This is exactly how Launch Base should have felt like! Let's get into a serious review before I start swooning..
Well, this is a Launch Base Zone remix. But what a remix! Instrument choice is well done, every instrument and sound effect is seamless and are in harmony, despite their wide variety. This gives the Launch Base tune a very catchy effect, with a slight groovy effect, emphasized by the drums and hats, as well as the sound effects. This sets a fun and positive tone which I would have never expected to work so well with the LBZ tune. The wise use of extending the main melody instead of following the original song's sudden breaks helps with the seamless feeling and actually helps the song being even more enjoyable; since there aren't the breaks one would expect, the song surprises you and keeps your attention; and the only time a break is noticed (at 1:53), it's not a sudden song stop as in the original; it's a violin... riff? Wow. Did NOT expect that, in a good way!
My only complaints would be that the fade-out is a bit too long, and that the song, dragging itself until 4:13, is a little bit too long and repetitive, but this isn't your fault; it's LBZ's that's already repetitive by nature. Otherwise, it's very well-made and this is a seriously underrated style. I'll end this with a personal note. I often roam Newgrounds Audio and sift through the well-polished generic turds to find THE melodic pearl; and this time, it seems I've found another! Great job there, feel proud and keep it up. Have a well-deserved 5 from me.