Unit-sending is bugged... I went to summon Lumineux, clicked "Send units", and then built 25 guys to send after the Lumineux, only for sending to not send it at all... hell, it even sent the 25 men without me telling it to.
Catch rate of three made Metang an annoying catch in Pokemon Black, even if I could easily find it in the Giant Chasm. I think I eventually tagged one with a Timer Ball. On the bright side, its typing covers up three of the weaknesses it would otherwise have, and IIRC it has better stats than Jirachi.
Romeo-S obtained in 34 missions... after several frustrating tries where I died rather early. Latest wipe in all my attempts was to the first mission with a Scarface... Shadow Dragon took care of it on my successful run.
Tried using ozzan's strategy for endless, but since I only had Romeo-C, I only made it to about level 31. Replacing him with a second Spartan timed me out at level 73. Not bad for a C-rank?
Oh, one final note: The ability to play as the techies instead of the magi would be interesting IMO. The only thing I can see slowing that idea down (if not out-right preventing it) is all the sprite-work you would need for the units and upgrades. Not to mention, the energy abilities would probably be drastically different.
In all seriousness, the first castle upgrade is VITAL. You want those crystals on the board so you've got back-up when things get overcrowded and you can't T-bolt them. I didn't buy any repairs/recharges/Frost/Shield, though, and the only reason I died once was because I neglected the castle up early on. Second try, castle up get, BA-BOOM. Crystals and T-bolt are awesome.
Bubble isn't supposed to be super-effective against Grass-types. (Okay, in all seriousness, this game gets absolutely crazy past level 20, especially since Fruit Rushes exist.)
Satin, try using the Fübar against Hitler. Alternatively, any Zanderium gun can do the trick, but they cost money to fire. What I like to do in a no-Fübar run is whip out the Zanderium Chaingun and say "MAH CHAINGUN SHOOTS BOULDERZ" in a goofy voice as I mow Hitler's lifebar. The MCSB part isn't necessary, but this game's impossible to take seriously, so whatever. Whatever you do, though, make sure you get the Chocobo Laser by wave 96. The Vulcan Vulcan Vulcan is stupidly hard to handle without that or the Fübar, and the laser can eventually be upgraded into a full-blown maser array that will get you all the way to level TGZRP.