Yes, this is AS3. The code's actually very easy to read, and I'd suggest this game for any noobs in Bytecode hacking.
Here's to speed up the mechanical mole, no matter what level it's on:
5e f1 0a 24 03 68 f1 0a
5e f1 0a 24 10 68 f1 0a
Change the bold to whatever you want, highest is usually at 09.
To change your initial fuel tanks (I'm being lazy, so if you choose to upgrade it, then it'll go back down to normal levels).
25 ac 02 25 de 02
25 b8 17 26 de 02
It changes it from 300 to 3000, the max.
To change the steering wheel level (same as above, upgrade and you lose it)
5d 0a 24 02
5d 0a 24 0c
It changes from 2 to 12, the max (in hex, of course). I suppose you could change the bold to higher than 12 if you really want to go crazy.
To change the drill level (same as above)
5D 0A 24 01 24 02
5D 0A 24 0b 24 02
It changes from 1 to 11, the max, and same with steering wheel level, you can change the bold to even higher.
Change the hull level
5D 0A 25 AC 02 25 90 03
5D 0A 25 C4 13 25 90 03
Changes it from 350 to the max, 2500.
Also, there appears to be a cheat system in which you can type " money" for 10000 money, "upgrade" to upgrade all to the max, or "downgrade" to set all of 'em to 0. However, I can't figure out how to work this in game.