Every good Shmup needs a cool gameplay Mechanic. R-Type possibly has the best one with the "Force" that you can attach to the front or back of your ship or let it float freely. Playing around with this is super fun.

The game is also super difficult as most shmups are. I still prefer Gradius II Arcade as my favourite classic shmup but this is close.

I couldn't beat this game yet but haven't really practised it too much. Stage 4 used to end my 1cc attempts alot