Okay, I also tested the hell out of it's 2nd pattern, which is really the only one where it's shape is determined by your movement. Even if I sprint around like a maniac in random directions for awhile, it's never literally undodgable. .....for me, anyway, which may be part of the problem.
Though, that pattern is also meant to be taken slowly; chances are the player will learn that pretty quickly. Even once harder versions of it are implemented, it's still going to be a "take it nice and slow" type attack.
Beyond that though, right now, one issue is that I've got a major lack of feedback on both the Warden, and Terminus (the true final boss, at the end of floor 7). Hell, I'm not sure if anyone's even FOUGHT that thing yet. Nobody's said anything about it. Chris seems to think it's good, but yeah, that's basically the extent of the feedback on the thing.
Right now, it's looking like the Warden may be harder than Terminus is, which isnt supposed to be the case, but again, that's just from my own testing, which doesnt give me much at all to go by.
Both of these two can be tested in the test chamber, as with all of the bosses they now have their own selectable rooms. It's worth noting that the Terminus fight actually consists of three opponents: Palisade, Sentinel, and then Terminus itself. But the HP display at the top is displaying them all as "Terminus" just because. So when the first one pops and nothing else happens, it's not bugged, it just means you need to move forward. All three opponents together mean that there are four phases to this fight unlike the Warden's 5.
Of course, testing it right now (at least in my build) means that you enter either fight with just 8 HP, ONE freaking shield (what) and three missiles. No, I dont know why....