My god, controlling 4 characters at a time, and possibly even more, is totally chaotic! I love it!
The upgrades are awesome, they really feel like they do something to your characters. You feel so bad when you lose a Lvl X unit.
I'm also impressed with the number of units there is, I rarely had two copies of the same person in my party.
Only feedback: would it be possible to attack up and down? Whan an ennemy is above you, it is really difficult to hit him without moving back, and taking a hit yourself in the process.
But apart form that small detail, really great job to the team!