I seem to be about two thirds into the game, possibly approaching the end, so I figured it would be a good idea to share some of the little tricks that got me there faster. Endless Frontier isn't too tough, but everybody knows that Super Robot Wars isn't just about beating the game, it's about annihilating the game. This post is not really going to be any use to you if you're not playing this game. In fact, it will likely be boring. Be warned!
First, party layout. I try to keep both Suzuka and Haken in the party at all times, as these two are the only characters who have the Bless (1.5x experience) and Luck (1.5x money) abilities between them. I cast Luck whenever I'm up against a lot of enemies or a boss, since Haken doesn't have a lot of SP and money isn't that important in this game unless you're seriously saving up for the ridiculous items in Dorothy's shop. Meanwhile, I cast Bless for every fight. Particularly early on, you will level so fast with the extra experience that you get that you won't really have to worry about the high SP cost: recall that when a character levels up in this game, SP and HP are restored. I sometimes go without Haken and the extra money he brings in, but I always have Suzuka in my party. Equip the best SP-enhancing items on her you can. Even putting aside the Bless issue, her tremendous array of support skills and high SP make her the strongest character in the game.
Fill up on recovery items with your extra money. It's kind of obvious, but I was overlooking this until a couple of hours in. You are more than covered for cash for weapons and armor throughout this game, and all casting Luck really does for you is ensure a healthy item fund. You never need to worry about running out. Buy all of the recovery items that are made available to you: the weak ones, the strong ones, and buy the maximum 15 of each. This stuff should get you through any boss fight easily and it's going to enable you to just burn SP and COM every turn, leading to bigger damage and a faster win.
Burn SP during boss fights. It's worth it. If your character has a defensive spirit command like Guard or Steady, always use it to avoid getting KOed in one hit.
As for attacking, I am usually less concerned with damage than raising the Frontier gauge for special attacks, and I set my skills accordingly. If you're going this way, make sure you use both your support attacks (when you get them) every turn you can, especially in boss situations. Try to use the move as soon you get it: it definitely does more damage when you do it at the end of a long combo, but in my experience it's better to get the meter back to 0 and save your left-over attacks for building it up again. Dropping a combo just as you're about to use your special is pretty frustrating.
It's not really worth it to switch between characters mid-combo unless you're just messing around or trying to get a big combo number. Usually you don't want to go without casting spirit commands.
It's tempting to throw out your regular and supporting attacks at the same time, but you're just going to do less damage. In my experience, it's a lot more efficient to let an attack play out, then catch with a support, then attack again, and repeat from there.
You can cancel from one move to the other any time, but I only recommend you do in two situations: if the enemy is about to hit the ground (and you don't have a support attack), or if your next move is a high-damage finisher. In the latter case, learn where you have to cancel to get that 10% damage bonus. Just experiment for a few fights and you'll find it.
In my experience, KOS-MOS, Reiji, and Xiaomu have the fastest and most dependable support attacks. The others have a bit (or a lot) of lead-in time, and a fast support is going to help you out immensely in those spots where the enemy's about to hit ground and counter your ass.
Well, that's about it for fighting tips in Endless Frontier. Like I said, this game's not very hard, but I hope this helps you out a bit anyway. I figured I would dump all this information before I beat the game and this stuff works its way into the deeper recesses of my memory and hides out there forever.