I'm trying to understand what you're looking to do with this - are you trying to master it, or get a better mix, or change of the elements or add fx, etc?

I can't really tell from your question what/which you're looking to improve.

My first impression was the eq'ing needs sorting - nothing drastic, just more separation between some overlapping frequencies, but you said it was done on laptop speakers so I'm sure you'll get round to that.

The next thing is that it's (nearly) all down the middle - i can hear there is some panning but you really need some width and further separation of the elements to make them stand out and have their own space to breath. I'm listening on studio headphones and if anything they give too broad an image of stereo width and it all seemed to be in a narrow center spread. ALso, with tracks that have a lot of elements going at once they need to all have their own space otherwise it will just sound messy.

The bass line (well it's actually more of a mid line) does not sound right as a sound - I think you need work on that patch or effect it, but is that what you are looking to vocode? it could work on that but the initial patch doesn't fit with the rest of the sounds.

IMO, I wouldn't start thinking about mastering just yet. Waves plugins are the best and simplest option when you get to that stage.

I reckon, get your panning, stereo imaging sorted, eq it, then have another go at a mix down - all of this I'm sure will be sorted once you're on proper speakers.

Then post and get around to mastering.