First of all, great to hear you guys having so much fun with this game!
Victory! No one can beat that score! 
On a more serious note...look at Value destroyed. Bug? Or are walls made of diamond in the future? You decide!
Oops, I'm pretty sure I know where that came from. I'll find and correct it in the next fix.
BTW, I can confirm the crash resulting from self-destructing cannons. And in my first Factory run too. 
Sorry about that, I thought I'd tested that situation already. Sure seems like there's potential for a bug there. I'll fix it in the next release, too. Probably later today. Thanks for the reports and confirmation guys!
Really, what can I do now (no explosive weapons)? 
Wait around and hope the game spawns some hunters on you? They've got explosive weapons, and the sensors to try and peg you through walls.
Yeah, those little bastards are fast at rebuilding. Hunters don't start to gradually appear until level 3, so there's pretty much no way out of that situation before then unless you can shoot your own way out. It's true that on later levels you could theoretically wait for a Hunter to track you down, but by then you might have a crapload of Programmers waiting around the area.
BTW, I found a bug: if I make the game fullscreen and use Tab to scroll through targets, they are incorrectly offset.
Thanks for the report. I didn't have a chance to actually test fullscreen mode at all yet. I'll fix it for the next release.
About the whole fast/stealth build concept, it is 1) probably more viable in the mid- to late-game, and 2) best done with specialized equipment.
In the early game, hover is probably more effective than flight because there isn't much you can do to help offset the weight of the weapons and equipment you need to carry. But really there aren't a lot of reliable sources of hover units until you hit level 4 (Programmers--before that it's just Watchers).
If you manage to find prototype flight units, you will be in heaven--they are both faster and carry twice as much weight as normal flight units. 222% speed from a couple hover units is nothing--with several advanced flight units you can hit 400% and beyond! By then you can move 8-12 spaces every time the enemy fires at you, and will be hard as hell to hit.
Other parts that help with flight:
-Light-type engines (store little energy, but don't weigh as much)
-Early on you can harvest weight redistributors from Haulers
-Get a Gravity Neutralizing Apparatus around level 5--later on find a Quantum Shading Machine or Dimensional Manipulator and you are set for life (no one's gotten that far yet, though)
Stealth-wise, you need good sensor arrays and signal interpreters (steal from Watchers) to avoid dangerous robots, followed by ECM (have to get lucky for these) for fleeing, then terrain scanners and processors if you have the space. Later on adding Cloaking Devices (higher-level Hunters carry them) will help.
Do targeting modules stack? I spent some time with 2 of them equipped and didnt see an immediate improvement.
Yep, they *do* stack. You can even get >100% hit chance if you have enough of them. If you were using the basic version, they only add 4% each, so the effects are not as immediately noticeable, especially with all the factors that go into hit calculations (which cause them to fluctuate a little each turn, making small bonuses harder to spot). The prototype targeting computer is ridiculously awesome, if you can find one that isn't broken (level 5+).