Alien Arena is a game that was written by Duncan Brown. The game is a ROM swap for Joust, Robotron, and Stargate.
The sound board EPROM should be Robotron.
The game needs to have the watchdog disabled on the boardset. On the CPU board, with the board oriented such that the RAMs are in the lower right, you will see a clock crystal on the left. About 3 inches to the right of it, you will see a solder pad which is connected. Cut the trace between the two half circles to disable the watchdog.