For your level of player the base is well balanced with the missile turrets, fast shooting and explosion aligned efficiently. I see that you are putting all your structures in sync with your level. A good advice would be for you to raise the HQ level only after your walls, defenses and shields have been level compatible with it, to avoid rebel attacks by commanders who are better developed than you. The Parameter that determines the opponents takes into consideration your level of HQ, medals, and the improvement of your defensive posts. Do not be anxious to push the HQ a lot, to achieve the greatest amount of unlockables, try to grow in synchrony and you will have great results in defenses and attacks. As for the squad center at your level, look for heavy snipers and troopers to defend your base. Ask your squad mates for these donations, so you'll improve your defensive efficiency even more. The traps, be sure to raise their power too, are great at decimating mass troops and vehicles. Do not commit the crime of uparting the whole base and forget to upar the traps.
Congratulations on Base Commander!