Swarm Sonata Update #1: New weapon and changes

As I continue my study project in Godot, I had a chance to put in a new weapon: a Sword Swing!

This weapon hits in front of the player, swinging from top to bottom and has a very strong pushback. In later levels, it becomes really big and can hit half the screen in a single swing.

This weapon gave me a chance to dive into AnimationPlayer + Area2D collisions, and the way the collision can be turned on and off during the animation (dynamic hitboxes, yay!).

Other changes to the game are:

- Limited the maximum level of every weapon to 20. Reason: weapons got really ridiculous at high levels (the shield could hit enemies outside of the screen). Also it is very hard to balance if there is no cap (not that I want to balance things, I just want it to be fun)

- Changed the health scaling of the enemies to not become trivial

- Changed the pushback resistance scaling of the enemies for the same reason

See you at the next update, stay tuned!