Thank you for your comments. I much appreciate them.
Something you're probably not aware of is that I only picked up the guitar again about 5 months ago, after a 30 year break (and then I only played rhythm).
Now then... {rolls up sleeves} I'm actually using this tune as a practice/development piece. There are quite a few aspects that I need to improve on and they are all present here.
I do indeed tend to pick in a downward direction almost all the time. It is taking quite a while for me to get used to the idea that the pick has two sides
It is something I'm working on.
No slides? Come on, there are at least two
Again this is work in progress. I've found one particular place where a slide (if I remember to do it) makes playing a lot easier and smoother sounding. Along with that, I'm also trying to do a hammer-on in a couple of places, with mixed results.
Vibrato/bending is something I suspect will take me a
lot longer to perfect, but it's there on the list
You last point about percussion is one that I expect the other forum members are sick of hearing me moan about - I have no affinity at all for it, and it is extremely hard work. Most of my tunes do without, but again I try to do something with it when I can. Very occasionally I surprise myself and something actually sounds quite reasonable. This is not one of those occasions.
Having said all that, this is very much a work in progress, and eventually I'll submit a new and considerably improved version. This won't be next Thursday