In my opinion after having played the game a lot I think the multiplayer is great but the solo experience slightly less and needs an improvement and because of that I'm going to give my suggestions for the next update on how to make it better and more fun.
In solo you're always hiding behind objects because if you're not on your guard for a second you might end up dead and have to use a life because nobody can revive you but the addition of a friendly cobra AI tank that would be able to help you and heal you and always would be there would be great. In order to keep the balance the friendly units stats would be the same as your tank and they would improve as you upgraded it.
If this unit would die it could be revived just as your normal cobra teammates and it can't use a life.
Another suggestion would be to add a new enemy tank that would have the ability to go underground and cause destruction from behind.
For now these ar all my ideas.