Hello, thank you very much for playing.
You are right the proof of concept has a lot of bugs. I only fixed the most important ones so we could play the game.
In order to pass the game with Gina or Keitaro, it is highly recommended to spend the burst bar in PowerUp/SpeedUp, pressing the A button, once the ship is 100% powered up we can spend the burst to break enemy bullets that can kill us or to take more life from the final bosses.
I'm currently making another proof of concept, this time a vertical Shoot'em up. It's about the invasion of Shylax. It will be a 2 player game and it won't be for MegaDrive, but for PC, as I'm making it in Java using the LibGDX library.
I take note of your comment, and for the new proof of concept I'll change the bar name so it won't be confusing.
Best regards