A few days ago I was messing around with MAME, and using the "play random game" button. I stumbled across a 'shmup I have NEVER heard anyone mention, and never makes any top 10 lists. The game is completely manic and a I love it! It almost looks like an early version of Pro Gear, and the look is very steam punk. You fly an old bi-plane (with a grappling hook that can catch and sling the enemy!), but when that gets too shot up you can jump out and run through the levels on foot. Sooner or later you'll stumble across elephants, horses, and other fighters you can jump into. Very challenging game. Any guesses on the name?
"Boogie Wings".
Seriously, check it out. Severely underrated and great for those of have played a bit too much from Cave/Toaplan/8ing/etc.