I feel like there are a ton of Ruby clones everywhere aside from the last zone, such as Aracnhe, Death... I mean, same hairstyle I guess?
I was also wondering about the barricaded door, and checking comments does make me think there will be DLC. Perhaps if reception is good enough, we might even get something more than just a zone with different enemies.
As for my playstyle, I didn't bother with gun aside from level 10 single shot, which is there to bring down those pesky fliers from the sky. She has a stupid big gun glaive (most of the weapon is gun except for the sword sized bayonet), and I'm going to chop them nerds with her gun glaive. Although I kinda have to agree on the rather underwhelming upgrade system; there's a lot of levels but the gains are small, especially in higher, more expensive levels.
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No ammo? No problem! Just swing it! (disclaimer: dodge mechanic is tied to ammo, so reload somewhere safe before running out!)