Splash:

Why do I have to press play?

In-Game:

I want the bloom amount closer to the bloom costs, so they are easier to compare.

Taking this further, a visual aspect would be nice.  Since there is a bloom cap, a bar would be possible.  Perhaps show the cost as a mark, and the current amount as fill - I'd have to see it live to say if that works. (pity mods are off the table for now)

Server Hanger:

I'd like a way to mark or favorite parts, so that it's easier to juggle parts between servos.  Perhaps automatically highlight recently used parts.

Actually, being able to drag a part from one server to another to swap them would be even better.

The rotate buttons should be closer to the servo.  I thought they were part-list page buttons at first.

Bug: When switching from a two-handed to one-handed, (rifle to pistol, to be precise), the other hand is initially shown as an empty fist.  When I select a weapon for the alt hand, the 3d model shows no arm attached.  Clicking a weapon again fixes the model.