Damage output seems a bit low (NB it's 20, not 30), you would need to boost that with tools and trainers. You will probably be attaching an energy to Eevee in the first turn anyway in order to evolve immediately. So why not just attack with her too?
Other options for a hit and run could include
Alolan Sandslash - 50 for [W][C][C] (plus now you have draw power)
Manaphy hits 30 for [W][W]
Blastoise EX hits 30 for [C][C] & opponent must switch also.
There are a few non-water options you could look at too, but each looks to make the deck a little clunky due to mixing energy requirements. Strafe Yveltal or Umbreon-GX are first to mind.
I expect most people will not play Glaceon in this style though, simply because there is no card in Standard that really fits what you are trying to do. More likely you will see it paired with Alolan Ninetales (both), or Zoroark, or just in a general water toolbox type deck.