Played this for a little bit, haven't finished it yet, but I'll probably come back at some point.
Below are my thoughts if you're interested in them:
Regen/Vamp Op. A single pickup takes me from being scared of every hit, to barely watching my health as I dive around for coins.
Stage boundary should be visible. It's frustrating to faceplant into and get hit by a shot I was trying to dodge. Also the coins that spawn out of reach are annoying.
I would prefer a more complex collision box with the character, IE thinner collision for legs/head, current for torso. Bumping into the box at her feet is fairly easy to do, particularly at bigger sizes.
The game doesn't make me want to have 2 orbs, other than I now have twice as many bullets. Often I would just stack them and move them both the same direction
Levels feel quite grindy - they take so long and lack tension.
Lack of enemy variety. The above two could be fixed by improving this. There needs to be something to force the player to make decisions. As an example of one addition, some kind of enemy that has a slow moving shield that it tries to face toward the closest orb (Still needs to be slow enough for a single orb to run behind, but fast enough that it's easier with 2)
Boss fights are over too fast/not epic enough (at least the first 3 bosses)
Ricochet doesn't appear to work
I don't think pierce works (not that I can remember a time where there was something to hit.
Area damage works, but has no visual effect.
Explosion exists, and seems like a better Area damage that comes with a visual effect. Unsure if there's a reason to have 2 of the same effect.
Chain Lightning works but has no visual.
The one time I grabbed speed, it appeared to make the red orb faster than the blue.