I think it's one of the most overrated "Hidden Gems" of the GBC, everyone who talks about it talks about how amazing the music is and I'm like "Wait what? Seriously? This music SUCKS! It's AWFUL!" and I mean it, the soundtrack abuses arpeggios like there's no tomorrow, and it physically hurts my ears! I believe it was Manfred Linzner who composed it, which baffles me because his music can be SO much better than that! Absolutely his worst soundtrack...
As for the gameplay? Double awful! Well, it's not as bad as the music, but have you ever played a spaceship shooter where you ship has momentum? No? That's because Spaceship shooters shouldn't have momentum... But this one DOES! You know what that means? That all the precision of controlling your ship is gone! So you're much more susceptible to cheap deaths and it's harder to hit your targets...
Not to mention, your weapons and powerups are bad! All of them! There's not a single spread-shot, and I think in some of them you have to keep on mashing the button to shoot, but I don't remember, I haven't played it in a long time, and I have no plans to play it ever again...
Oh well, at least the graphics are nice, I've seem them being described as "Almost 16 bit quality" and well, they're not far off, but it's of course not gonna look as good as a 'real' 16 bit shooter, but it does look pretty nice indeed...
But then again, this is all my personal opinion, you could end up loving the game, I know a lot of people do and that's fine, but I HATED this game, it's pretty much the worst shmup I've ever played...