Honestly, if you hadn't said that this was a mashup of existing songs, you would have fooled me into thinking this was its own thing. And it's very well-made too. Definitely another step up from your original mashup style of just combining song segments. This is impressive work!
Wow, really? That's awesome! Thanks, man! :)
Enjoyed the song. Mixing is still troubling you. Specifically drums. I would side-chain them still.
Serum synths do sound good, if a little generic, and your transitions are much better. I will say, this is a proper remix and mashup in one. Although I will say people HAVE done this before. It's just quite rare. Look up DJ Earworm, but pat yourself on the back at the same time because you did more than just creatively mix up a bunch of stems.
Once you get mixing and mastering down, you'll be a fine EDM producer. We all start somewhere. :)
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