This remix is not bad, as the new melodies you brought in are fine. But everything lacks power that can be gained with better mixing and more practice. Also the dubstep drop was short lol
The build up needed more suspense :/ and the drums did not give the track the 'punch' it needed.
I actually loved the sound at 1:38... but everything else lacked impact. I recommend you try to use serum, or other synths because you may find that you prefer others more. All of the knowledge you need really comes in with experience.
The atmospheric feeling in the intro was effective, I will give you that. What stands out the most is that you lack the extra percussion in your tracks like hats and other percussion that you could add to make it vary a lot more.
Sound design is what you need to work on, when you have the time on the engineering side of things.