I was thinking it would be pretty cool if they added a Filters mode where you could choose a screen filter. These could be unlockable and/or achievable through towers as rewards.
Some examples:
8-bit
16 bit
Vintage
B&W
Amplified (2 colors are amplified)
Gore x2 (blood lasts longer on screen)
Gore zero (no blood)
Gore xInfinity (blood does not disappear)
Neon
Predator Vision
Toasty (fire replaces blood)
I realize some of those are modifiers but could throw those in too.
Kool idea TS, seriously. That would be fun, I especially like the idea of retro filters. I imagine it would be difficult to impliment, not that I know though, I don't. I doubt we could get something like this this time around, but I'd like to see this idea survive and be suggested for the next game. Maybe tweet it at Ed Boon or something.