X-Men, Robocop, and Lightning Fighters sold! Through the power of bundling, they went for great prices. Let that be a lesson to the rest of you out there still on the fence!
Sky Shark/Flying Shark is one of the few STG I enjoy playing without autofire at all. Something about the way tapping out bullets feels in that game is *chef's kiss* and I've never seen even Toaplan themselves replicate it in anything else.
E: Use buttons like Seimitsu PS-14-G for best effect
It’s a really good shooter for learning the basics. I’ve always pushed Flying Shark and Aerofighters (the first one) as really good shooters to learn fundamentals