sep 2023, code by JTZ
Inspired by Svolli's latest prod, I also played around with the plasma effect on the 2600. This is my best result so far.
The attached version with user controls takes 418 (without 288) bytes.
Note: You can change 8 parameters (wave lengths, animations speeds) using the joystick (directions with or without fire, left difficulty A or B). Pressing RESET resets. :)