After a while it's just more fun to take out everything between you and the Mexican border. Screw the felony meter, I'm a good enough driver to avoid the helicopter mines!
General advice:
1. Buy Sticky Shield as early as possible. It takes a lot of guesswork out of the process.
2. Even with several levels of Shield Bounce, rockets are painfully slow. Lead rockets as far as you can.
3. Fireballs hurt most, but are slower than plasma.
4. When "boss" tanks show up, kill everything else first.
5. Buy Energy Infuser before you buy Shield Bounce. The tanks gain HP, but their shots never change speed.
"Just a minute, sir, I'll bring up your luggage when I'm done KEEPING THE F***ING BUILDING FROM BURNING DOWN! Sorry, ma'am, I'll get that taxi in just a second, I need to beat the s*** out of my bartender!"
I greatly enjoyed this game, and despite having gotten all the badges, am playing it again with a few new rules.
- I must not wear any gear.
- I must sell all non-artifact, spell, or potion/ether items at every shop.
- I may only buy potions/ethers.
- I must start at Floor 1.
The goal is to see how far I can go every time until I complete all the achievements.
 "Ruby Loft Escape"){kind=icon}
 "Robot Wants Kitty"){kind=icon}
 "The Soul Driver"){kind=icon}
 "Shield Defense"){kind=icon}
 "SNES Music Quiz"){kind=icon}
 "Bed and Breakfast 3"){kind=icon}
 "Globetrotter XL"){kind=icon}
 "The Enchanted Cave"){kind=icon}