Add a new Script to EnemyContainer

Set up a variable for the enemy scene

Set up a reference to the Timer node

Set up variables for all of the animation frames

Set up variables for each of the different 

SpriteFrames

Set up variables for the grid of enemies

We leave 100px gap between each row and column

Set the starting position of the grid of enemy

Top left corner of the grid starts in the centre 

Of the screen

Finally set the screen bounds

Same as for the Player

Create a function to assemble the sprite frames
Create  a new SpriteFrame resource

If it doesn't already have a default animation - Add it

Add the first frame to the default animation, duration is 1.0s
Add the second frame to the animation, duration 1.0s

Return the assembled SpriteFrames

Add a function to create the 3 individual frames

Build the squids, crabs and octos

Add a function to spawn enemies

Create a nested for loop to create the rows and columns
In each row and column
Create a new enemy scene

Create a variable to access the AnimatedSprite2D of the enemy

If you are in the first row create a squid
If you are in the second or third row create a crab
If you are in fourth or fifth row create an octo

Play the default animation
Pause the animation

Calculate the starting position of each enemy
Place the enemy
Add them to the scene

Create a function to move ALL the enemies

Move the enemies by 20px at a time

Set a variable to check if they hit the screen edge

For each enemy in the group
Change the animation frame as they move

If you hit a wall on the left or  right
Exit the loop

If you hit a wall
Reverse the direction
Shift ALL enemies down

As enemies get closer to player
Increase their movement speed

In the timeout signal

move the wave