Sorceror controller

I am building a Sorceror controller. The basic idea is to benefit from Heighten spell and Twin spell, and Innate Sorcery to make the control spells really hard to resist. 

I also started with Magic Initiate (Druid) Entangle to get a group control spell and Sleep. 

What do you think are the best Subclass and Feats (including Origin feat) for the control Sorceror? 

I realy like the Draconic subclass as the exta ac, hp and spell are realy good (command as a non concentrate spell to make them come back wtih Approach can make them walk back into your control aoe spells.)

For Orign feat I like Spellfire Spark as it will let you cast  Sacred Flame and cast it as a Bonus Action (PB times/Long Rest) and reduce magical damage by 1d4 once a turn.  this ups your dpr a little and reduce the damage you take a little.

for a level 4 feat if no one in your party has it Inspiring Leader is great.  at level 4 with a 16 chr you are getting 7 temp hp every short or long rest.  In a party of 4 that is in effect 28 temp hp and it scales well.  I also like Telekinetic as it help move people back into aoe spots or move you own team out of them before you lay it down.

Instead of twin may I recommend carefull spell instead.  you can even use it one your control aoe spells at lease for the first save and a few dm's will let it go for the whole duration instead of just the first effect.