Interesting choice for a cover song.
I found the original on youtube and watched it after listening to your cover. I think the original compensates for the low vocal energy (that Dan mentioned above) by doing a subtle note-for-note doubling of the vocal on a bass synth, as well as a second vocal with a heavy vocoder on it.
Overall, your version sounds more ambient/cinematic, and very good. :) Your vocal could come out more in some places, but maybe adding some of the doubling I mentioned would be enough? If you even want to do that.