Rocket Merger

You have a target - small mansion in the Forgotten Woods.
And a rockets. A whole lot of them.
Get one rocket for this mansion. Then another one, and one more.
Let's face it - this nasty building is too tough. You need more firepower to bring it down for sure.
But how can you get more of this shiny little explosive beauties?
The answer is simple - get another rocket.
And.
Swipe 'em to merge 'em!
Right - two rockets combined gives greater rocket!
You can combine your greater rockets together again and again.
Till you get the most powerfull rocket ever built!
And then hold on to something and destroy your target!
Kaboom!