Not bad
Here's a list of the glitches I remember.
Bloodlust continues to give HP and SP even after the enemy is dead (e.g. if you hit an enemy three times and kill them on the first hit, bloodlust activates 3 times) This makes Limit Breaks, especially Axl's, incredibly OP once you get Bloodlust. Furthermore, after a bloodlust, skills that can kill groups of enemies become basically free and can actually give as much as 30% of hp and sp recovery while doing damage.
Some scrap is unattainable at later stages, such as the "Transmitor". This left me with one character who couldn't get his last battlechip due to not having enough scrap.
Some upgrades don't seem to work, such as the upgrade that decreases the shop costs.
Sometimes, when I win a battle, the battle continues behind the victory screen. If it's my turn and I try to select a move, the game freezes. The solution is to press the backspace then space to advance past the victory screen.
Stealing doesn't actually steal anything, even if successful.
Loaded is VASTLY overpowered: after getting the upgrade to make it charge fully after only one use, I was capable of hitting OVER 77,000 DAMAGE on the green final boss with basic ranged attacks with Axl, and that wasn't even a critical.
It's possible to somehow get N/A Upgrade points from one of the upgrades on Tier 5, which makes the game really easy.
As other people have said, some abilities and items freeze the game.
One of the (green?) walker's attacks has no visual or aural representation, it just does damange.
Some of the Iceman chip's ether attacks happen on the top-right of the screen, rather than on the enemy.
There is an achievement page but no achievements, the ability to cast spells out of battle but no reason to do so, etc.
The shop upgrades don't appear to do anything.
When you kill more than one enemy at the end of a battle, only one of them dies. The rest just stand there and the battle ends (I'd rather they all died at the same time, because it takes less time).
Once you lose the "Money" and "Scrap" options (after Round 2, I believe), getting money becomes really hard, unless you sell gems over and over again (even then, it isn't anywhere near as much money).
There are a number of typos (Poisen, Transmitor, etc.).
After selecting "Start" from the Arena menu, I can't press backspace to go back to the previous menu. If I accidentally select that I want to start a battle, I can't cancel that selection.
The third support unit is OP. It can oneshot three of the 5 final bosses if it gets a crit on the blue guy (after it gets the upgrade that doubles its damage).
Momentum along with regenerate (which I get as a buff at the beginning of the battle) is OP because it has a 20% chance to give haste to all of my characters every turn. Also, for some reason, regenerate recovers Axl's hp by around 1000 every turn (around 30% of max health), whereas it only heals the others for around 200-400 (5-15%-ish).
Autorez doesn't seem to work for me. That, or "Smart Revive" doesn't grant autorez.
There's more, but I'm out of characters.
In other news, I'd like to have some more battle chips. The ones that are there are well-balanced, but I don't feel like I can make a pure-Ether or pure-Charge character because the chips available just can't do what I want them to. I'd also like to see another Limit Break for each character, because there's a window for it already and I'd like some more customization. I'd also like to be able to "dismiss" Limit Breaks without losing a turn so that I can heal and stuff. Most of my losses were due to not being able to get rid of my limit breaks fast enough.