I really like the organic orchestral instruments combined with the synths. You blend them really nicely. The synth reminds me of the DKC's Aquatic Ambience music for the underwater level. You have a really good intro. You have a nice soft motif that you've introduced with the synth, and the strings and drums compliment the main theme softly. You also transition to your second section starting at 1:48 nicely. The mixing holds it back a little bit. The bass is boomy and makes the mix feel crowded like the compressor is being pushed. And I can tell the issue lies mostly with the bass you have since when this section transitions around the 2:42 section when the bass is only playing a note and ringing out, the balance sounds nicer. I think the other part that's contributing to the bass's boomy feel is that it only feels kinda like a synth in the sense that it's only low pitches and doesn't emphasis the higher harmonics. I can tell they're there because I can hear the plucking like sound of the bass, but it's not well defined. Drums could be louder so they sound closer to the front. The third section starting at 3:13 Sounds a lot different compared to the rest of the song to the point that it makes me think that you're treating this is song as 3 different songs for the three scenarios of the challenge. This section reminds me of an older Street Fighter game. By itself, this section comes across as high energy and definitely has final boss energy. The sound choice is good, but the mixing holds it back, similar to what's happening in the second section. The mix feels crowded and could benefit by making sure that you're leaving headroom before pushing your compressor. The lead synth you have is a great choice and I like how it soars in the mix, but it could use a little refinement. It sounds a tad dry and under processed. Just a touch of reverb would help it out a lot.
All in all, aside from my critiques I like what you have. I like to see when people are experimenting with uncommon time signatures, and none of yours felt unnatural. Not the easiest thing to do. Honestly your piece as a well-crafted feel to it. The soft intro has a really nice touch, and the 2:42 section compliments it nicely. I think this is a good display of raw talent, but just needs some practice and refinement.