Major changes:
- added Readme
- included sensible directory structure
- resizable window now uses stretching
- main menu UI organized in containers
- less reliance on get_parent() or get_node("..") calls
- more usage of signals and groups
- split the large level scene into enemies & tilemap scenes
- moved the hud out of the player scene and into the main game scene
- player can now shoot by holding the space bar
Room for improvement:
- the enemies use very similar code and could be generalized more
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