Thank you!
Good point on the bullet color - currently the enemy bullets are always on top of everything else so I assume most people are fine with how it is (haven't received feedback on player bullet color in particular before), but it could definitely be changed in color and made more faint, which I may do in the future.
As for why is there a vampire, why is he confined in a silver coffin and why is he floating through space? Well, this question won't be answered fully for now but I'll say that he definitely chose to be this way :) Why bother conquering humanity when you can just chill in your advanced Magical x Technological marvel?
I would like to make more improvements to the game in the future, as the game engine gets updated to allow for more features I want. Thank you for checking it out!
(Also, just to make sure, please check again whether you've rated the game or not - on my end it seems that the amount of people who rated this game is same as yesterday, though I may be mistaken)