Well...
I wouldn't say it sounds anything like TMV. Just because you use similar instruments a high tempo or similar ideas to them doesn't make the song similar. This has a bit more structure than a TMV song. The Mars Volta has a bit more of an abstract sound and I think you're right. What you're missing is Omar, because he is the creative design of The Mars Volta and its music. You'll never write anything similar because it's his style. Just listen to your own music, you have a style . Listen to anyone else, they have their sounds as well. It's a matter of what you're capable of and finding a sound for yourself.
That being said I'll move past your comments and to my own of the song. The mixing seems a bit dry. The drums are interesting but I think they're hindered by the mixing. The organ could be brought up a little in my opinion. It's really repetitive as well. I'd use a different bass sample or VST as well it just seems kind of bland to me. The ending was pretty cool and a few other spots in the music, but other than that I was a bit bored.. I'm sorry if I couldn't be exactly helpful but I do hope you take some things into consideration.