Well, nice track in the end IMO. The drums, main "washed" synth and those fake electric guitars sound nice and I like the melodic arrangement here. High & low end under control as well, good job. Suggestion here would be to deal with the following ( that's also what could make it hard to mix vocals into this track I think ).
- Re-balance the levels of the synths ( they need to be lower ).
- Reduce the filter cutoff ( I mean closing more the filter ) of the 1st pad & this ambient synth that starts around 0:24.
- Control more the stereo spread, it's probably too wide right now and that could be why it takes so much room in the spectrum and makes it harder to add vocals.
- Some tiny adjustment of panning ( like around 2:35 ), the panning of the lower background synth doesn't sound very natural, it's very pronounced. You can play with the pan value as well as levels ( lower ) here.
But yeah, nice one in the end, it could be longer though and for sure bringing vocals into this one might give you the chance to develop it more.
And hey, have you watched this new tut BTW ?? Good stuff on the Synthwave genre in this one
Tech & Tips N°57 What is Synthwave