i tried to list everything i added/changed/improved chronologicly:
i used the "Improve my Game - Gamejam" to wrap up this tiny project. 

• added 8 directional player movement, before it was only 4 directions.
• created clouds, and let them wrap around the screen. added a slight animation with sprite offset y and skew to wobble
• reworked the sun and the sun movement. still not really good though^^
• added in different background, mid and foreground
• gave the terrain a different colorgrade better fitting with the new backgrounds
• each gamestart or restart all backgrounds and the terrain gets randomly mirrored, so have a little bit more replayability
• each gamestart or restart all enemy positions are randomly set in a specific game area to get a little bit more replayability
• added swordfish as another enemy
• changed swordfish and big shark damage from 1 to 2 hearts
• changed the title from underneath us - deep dive, to "Deep Dive" -> less clutter on the screen.
• added in texture buttons for the UI
• changed nearly all fonts to be white, now white big dark outline to make in more readable
• changed the position and outline of the game over and game won text
  
• the score shows now how much gold is in the game and how much you have picked up 0 / 30 for example.
• change the score color to yellow as soon as you have picked up one gold coin
• score changes the color to green as soon as you have picked up all 30 gold coins
• reworked the o²/Air tank. it is no longer transparent and has a completly new sprite
• changed the positioning of the hearts and the airtank - underneath each other and now in the center
• changed the hearts from having a white outline to a bigger black outline
• fixed a few bugs
• known bug: still a problem with the boat and the player animation near the water surface
• Further improvement: maybe add some sort of glow to the goldcoins to make them more visible behind the seaweed etc.
  
  Added screenshots and created a theme/design that fits the game