Nice round stars - nice galaxy. Not bad at all!

But you are right - you won't get much further without a better mount as you really need exposures upto 5 minutes to get teh faint outer reaches of the galaxy arms.

You have a good set of data for the bright bits - keep them and combine with stuff you get when you can go longer

I recon with the stars as round as you have them, that you might get lucky and have success upto 1 minute

Only critique I can offer is that you have lost colour somewhere in your processing. Ther are nice orange stars in this field and you don't have them