Hmmm, I disagree that netplay would be a good addition to this game, don't get me wrong. The game is great. But its linear left to right which can get old, and it seems like one side would increasingly get stronger and unbalance the game quickly... If you plan on netplay you really need an overhaul -- ladders, more weapons, etc, if all you can do is go left and right and hit in the middle, it seems like a basic tug-of-war, where one person is constantly getting stronger, and the other stays the same, which will get old quickly.
I'll have to download the 100 second version, my bane in the speedhack entry was the mindset "crap 5 seconds left, gotta rush in, crap, dead, crap crap crap" my highest speedhack score was about 17k...
As for the person who got up to 1700 health, maybe their should be a quake style health cap? Ie, you were allowed to get over the maximum health, but after an amount of time had passed since the health had been picked up, the health started ebbing away back to the maximum...
Also in the speedhack version (I dunno if its there in the 100 sec version) with the grenade launcher, when you ran out of ammo it would switch you back to another weapon (this is good), but you could switch right back to the grenades and go negative in ammo, and just keep throwing them all you wanted!
edit: a cool addition would be vehicles, as in: tanks, jeeps, helicopters, jets, manable turrets/bunkers, manable turrents on vehicles! AA guns! etc... that would be cool!
edit2: and those dropping bombs could be dropped by random enemy planes, or sometimes they could drop parachuters... anyway, I have a habit of requesting an ungodly amount of complicated features. OOh and some scrollable screens where the hills might be so high that the screen scrolls upwards, with a scrolling upwards screen giving plenty of room for dogfights, and maybe turn it into a MMORPG where the main character is an elf... (hahaha... sorry, heh... couldn't resist.)
It's a great game how it is! -- My $.02