Original version of game was running on PIC18F6622 and Dingoo A320. Now it's running on Papilio One 500K + Arcade Megawing. I've used the ZPUino soft processor which is realized by Xilinx Spartan-3E FPGA. VGA signal is also generated by the FPGA. The game can be played with integrated buttons of Arcade Megawing or with Atari/Commodore joysticks. I've used a QuickShot II Plus (SVI-102 Plus) joystick in the video below:
Please, use the .bit file included in the ZIP. Otherwise buttons and joystick are not working properly.