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You have a good idea going! But let's work on some basics first as to not overwhelm you. I'll start with the basic idea of the track itself. You imagine this as a Smash course song, but as it sits, I don't think it has enough energy yet. Some more drum work and adding some bass in there will help wonders to get that energy. If you listen to the remix tracks that the Smash games use, they all have energy throughout. Even more "symphonic" style themes, remixed for Smash, have energy. You start to build it nicely with the orchestral drums, but it needs more once the theme kicks in. Now onto the instruments themselves. You have a pretty good selection for what I think would fit in Smash. Only exception is the chorus that you use. Its way too muffled. If you can't find any free VSTs, there are plenty of open and free sound fonts that can do the job. Also as stated earlier, a good bass instrument (I prefer synth types for energy tracks), would do great as well. Last for now is when you add the main theme at 1:16 and 3:00. This is almost an exact rendition of the original track. If you are going to use the same instrument for the theme, try slight variations on the theme or change it's structure so it doesn't seem so slow (could be the lack of energy that's emphasizing the slowness). Even better, try increasing the tempo a bit. That might help too with the theme. Comparing yours with the source you provided, makes it almost seem the same. We can work on mastering and such as we go. Hope that helps! Good start!

Earth Kid has a beautiful voice. Incredible work!