So the “Screen” blendmode is pretty cool. It makes the white parts of the bullets stick out above the colored glow. It doesn’t look so good on some dense patterns though; you mostly just see white and lose all the colors.
I’ll stick it in as an option, and players can decide which blendmode they prefer. It doesn’t seem to effect performance much.
I’ve also been playing around with particle effects, but I think I’ll not use any. They look cool, especially for enemy deaths, but I think they’re quite distracting in a game like this. I think I’ll just animate some of my usual circular explosions and blast waves.
I don't know how that would affect performance, though, nor how much work in might be.