This took an interesting turn. It's a very different style than I'm used to. The only thing I really have an issue with is the mixing. Some elements get buried in the mix and some elements stand out too much. A compressor can help this pretty quickly. Another thing that might help this is a bit more mastering, which I can probably help you with. One other thing that can help the mix is careful panning and reverb. Small amounts of reverb really help the sound put itself on a stage and the panning helps the placement. I can hear a bit of reverb, but I don't really hear panning, so that's one thing I recommend you do. Even just 5%-10% is enough to make it separate itself enough that it's easier to pick out of the mix. And that brings me to a tip about mixing/mastering. Usually I consider a mix good if I can pick out each instrument with ease, so as I said, panning can help with that. (The things that need the most work mixing wise are the lead and the piano in my opinion. They're a bit loud.)
One other complaint I have is that the Mario coin sound effect was a bit overused. There were some sections where it just felt like it played over and over again. However, this is mostly just preference. I just find it a bit distracting from the more musical elements of the song. Most times I'll use sound effects for transitions, but not much else. Again, this is just my opinion.
Other than that, you did a pretty good job on this. It's very different than what's usually considered video game music. I also think the melody has a bit of a Waterflame feel to it, which I found quite interesting and I thought it was a nice surprise. The orchestrated sections were very well done, and they added more variation to the song, which is always good to have. Overall, very nice work!
8/10