About Zombotamy 2, you should use potato bombs to lower your defense cost at the beginning. The key is to use the Tallnut to make a shelter, put everything behind it, that makes one line safe. When you make all lines safe, it's almost done.
Prepare some immediate bombs against the bomber, that's a great threat.
I don't have any cheat code for unlimited sun.
You just 4 spots planting twin-sun flowers, which is enough.