Sanctuary Fortress is my favorite tune from the Prime trilogy. I think you have a fantastic general idea of what you want this arrangement to be. The source tune has a lot to offer and you're fleshing out a lot of it well. There are two constructive criticisms I can give off the top of my head:
1. The single note piano line sound that you're using is far too dead. I'm hearing the hammers on the piano strings more than the actual notes. You can add a high pass filter on that and a little reverb, and I think it will blend it much better with your song.
2. The wacky sine wave freakout section (the one that's basically like, the signature of the original song) you have is cut and pasted throughout several sections of the song, and after the 3rd time it shows up, it's a little predictable and a bit flat. Maybe you can write a second version of this and go back and forth between the two versions, or add some filter sweeps/panning/octave jumps/whatever to liven up that section. I actually made my own version of this song, and I listened to the original at 0.25x speed on YouTube probably 20 times to parse out all those notes. You certainly don't need to go that far, but there's actually a lot of crazy stuff going on that you can parse through.
Unfortunately I don't know much about EDM production to offer focused advice on that front. But from V1 to V3, you've made leaps and bounds with the instrumentation, flow and dynamism. So, yeah, keep it going!