Alpha Fighter/アルファーファイター (Arcade, 1979, Data East)

This is Alpha Fighter/アルファーファイター for Arcade, and it is a Space Invader clone running on Vic Dual hardware while also having similarities with Space Attack. The fighters come from above and are slowly descending, you must shoot all of them before they reach the surface. A UFO will appear for mystery points and after all fighters are hit, you can see the UFO moving down which results in 150 points decreasing to 50 points. An extra beam cannon will be given for every pattern cleared or at 1500 points. If you get hit, you lose a beam cannon in the explosion. As you continue, the fighters will get nearer, it is only over once you run out of beam cannons. This is an alright game to play, the fact it was also released along with Head On is surprising since I believe this was originally advertised in Game Machine as 2-in-1 Eagle (Alpha Invader/Head-On)/2 in 1 イーグル (アルファインベーダー/ヘッドオン) in August 1979. Probably might be the real thing or the working title of the game and it was also said to be released as a standalone game as well without Head On in the same day it was made.