As Genki and FetusZero said, it's sadly not as strong as the later games but a necessary step to witness the evolution of FLAT/Tennen-Sozai as a development circle. Each new entry of the series truly improved a whole lot over the previous.
On the plus side, GBC offers quite a brutal level of difficulty for those who love challenge and the scratch/tension system keeps you always at the edge, staying close to bullets in order to charge your special attack (which sometimes it's the only way to defeat bosses effectively!)
Alphaprospector
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Marketing and Editorial Consultant (the MEC) for Nyu Media Ltd. Also, I like mechs if it wasn't clear enough by the profile imagery.