This is ok.
The 303`s are very obviously plug ins and not the real thing.
This sounds like a slightly trancier version of some mid nineties acid techno, and the thing that stands out is the weak 303.
Really, there aren`t any good plugins that will do the job, but I suppose at a scratch, a audiorealism, with tons of chorus, proper overdrive, and a little verb will almost do it.

Production is a little muddy, and overall the lead sounds are a little dull (I mean in terms of movement, they could have more of an analogue feel).

The problem with a lot of new (pc based) producers, is not that the software can`t emulate analogue sounds, but that the composers have no real experience of analog kit, and therefore the knowledge of how to reproduce these sounds.

Now I`m not saying this is the case with you, but in terms of the instruments, it sounds like it.

The main lead sounds could do with phattening up, more movement with the oscillators and filters (subtley) and maybe being put into unison mode to give that wet analogue sound.