Changed UI and aliens speed and some bug fixes.

[sairampolisetty]

In this code I have modified lot of things.

1. Changed some of the ui settings.
2. Previously the aliens are not coming after few seconds now i have fixed that issue too.
3. And high score is not updating properly. I have fixed it too.
4. And also some bug fixes.

These are the things that i have done in this code.

I have tested it thoroughly and now it is working properly.

And i think there are some changes to do.

#fixed @YadavAkhileshh please review this and tell me if anything wrong. And also plese add hacktoberfest label also.

Thank you.

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