You play the role of King Kayus who’s riding a dragon named Bahamoot and starts his quest to destroy evil Zambaquous and his armies. Zambaquous wantss to rule the Agamen world, your world. Your dragon is a very powerful creature and can protect you from the enemy shots and the impact with various objects. Uniquely enough for a shoot em up, Bahamoot's body is flexible and responds to Kayus' movement, enabling Kayus to use Bahamoot as a mobile shield or as a whip-like weapon. You fly across six levels of Agamen, fighting a big boss at the end of each level. Gameplay is quite difficult (following other games by Irem such as the R-Type series) but with the protection of your dragon and the collection of various power ups, you'll have the potential to win and take your revenge.
The Atari ST port is technically quite good, but several details are missing here when compared to the Amiga conversion and the original. Strangely, both versions are using a different color-palettes compared to the original (coin-op) but still, but overall the game visuals are quite good. The Atari ST port offers up to 16 colors on screen here (no special color technique is used), whilst screen scrolling and sprite animation are both acceptable (the Amiga port runs smoother). Some sprites are amazingly large too! Overall, the ST port is a good coin-op conversion (considering the limitations of its hardware).
Sonically, you can choose whether you want sounds FX or music during gameplay. I guess the developers could do better than that and the Atari ST should play music and FX at the same time.