I was gonna make this post last night, but savefile.com wasn't working. It's back up, but it's running kind of slow, so keep that in mind.
Anyway...
http://www.savefile.com/filehost/files.php?fid=3859664
As the description says, it's 5,000 of the 10,000 floors in Hard Mode. I botched this together late last night out of boredom. The time's around 4:39 with a pithy 132 rerecords to its name.
To be fair, it isn't a very GOOD run. If I planned to seriously run the game, I'd be planning things out a bit more. It was just something spontaneous I did last night. Hard Mode seems to have the most floors, and it's definitely tough to get all the way to the bottom. Mainly due to some aggravating Air Bottle placement on some floors.
In a lot of cases, Air Bottles - which Driller needs to survive - are surrounded by four brown blocks. These take multiple hits to destroy and cause a lose of 20% air... which is exactly how much an Air Bottle restores. You can, of course, cause the blocks around the Bottle to fall, allowing you access to it, but that requires you to wait for them to fall, climb up, collect the Bottle, then get back to business. As you can see, I chose death over waiting in most cases. That's another thing I'll fix if I decide to go back and make a proper version.
Under 10 minutes is definitely possible. Getting the Air Bottle bonus, like in the speed run up on that one site whose URL I can never remember, is not an option. Stylistically, it might look good to get all of them, but it's definitely not practical. Waiting doesn't look good, as there's really nothing you can do during the wait, save for wobbling.
So, yeah. I'll be trying to plan a more proper version if I go back to it. As you can see in the file, I pass up some EASILY accessable Air Bottles in earlier parts, thus sending me to a slightly early death. Definitely avoidable.
If anyone's got some sage advice for the game, now's the time to slap it down on the table. c.c