I´ve donwloaded the game and played a lot. I have an idea for a new weapon:

Ground-goo cannon
The gun would shoot a ball of mud that becomes hard and turns ground. Another idea is instead of mud, green goo that turns solid or something like that.

It would be very usefull to close bunkers, making little islands in the sea, trapping hedgehogs etc.

A weapon with potential, I think. It should be off until x turns past, but very funny.

Let me know what do you think