2D Shooter

This is the 2D Shooter Project Tutorial version. In this version, I added small changes such as adding more enemies in the second level, and tested slower fire rate against enemies in the first level.

Proposed modifications for completed version:

1. Increase map size

2. Add power-ups or something similar

3. Change music and other assets

4. New enemies

*These are the changes I am most likely to do, but it also may not happen. Other changes may happen outside of this list.