I remember really enjoying Andromeda Strain, at least.
Mega Man 9 - Beat this. Got about 38% of the challenges done on the first playthrough. Sadly, "use no E-tanks" was not one, although I did try. Wily was just a bit too badass for me. I'll have to work on that.
Overall... great stage design (second to MM8 maybe?), an excellent array of weapons without being truly broken, and oodles of replayability built in from the challenges, speed runs, etc. Very classy little game, I'm truly impressed.
Notes:
Order of boss challenge... I'd say Tornado > Plug > Concrete > Magma > Jewel >> Splash > Hornet >> Galaxy. Several of the boss fights are actually rather clever (Plug, Jewel in particular). Game didn't set any records for this, but it was good. Wily bosses is Wily 3 > that damn ship > Wily 1 > Wily 2 > Twin Devils > four spike balls. Pretty solid creativity in some of them, but Wily 1 is just annoying I found.
Weapon-wise, in rough order of my initial impression of their worth...
The great:
Jewel Sattelite was probably the best. Take Leaf Shield, let it block bullets, and let Mega Man move while it's equipped (firing it with direction + B). Aside from lacking Leaf Shield's disgusting power (and it does vanish if it fails to OHKO), and costing 4 WE, it's about as good as shield weapons get.
Laser Trident is a simple, strong, inexpensive weapon that pierces. Owns Sniper Joes and flying shields, but doesn't set any records for utility.
Black Hole Bomb has awesome aiming and incredible power/range, sucking up and one-shotting even some fairly powerful foes. Expensive and slow, however.
The good:
Hornet Chaser homes, and grabs items. It's slow, but at least you can fire a lot at once.
Magma Bazooka is what Atomic Fire wants to be. Charges faster, the first level is useful, the strong version still isn't too expensive, and it has a spreadfire effect. Just wish it were better at piercing; I didn't find myself using it much as a result.
Plug Ball's a faster, stronger Search Snake that can also traverse ceilings. Has a few spots where it is very cute and effective.
The "at least they're not Hyper Bomb":
Concrete Shot has a bad trajectory and costs 2 WE for some reason. Has utility applications in the last level.
Tornado Blow is a stronger Gravity Hold that costs SEVEN WE. Yeah, obvious trash (though an understandable nerf after how ridiculous some previous fullscreen weapons were), besides one level where it's needed.
More playthroughs of this most definitely await!