Not sure if something has changed in the last couple of Stable versions but I never remember being sneaked up to by Invaders. But recently I've several times been minding my own business and just chilling and lo an Invader appears with "no" warning. Clearly I missed the on screen prompt/countdown. And in some Biomes the red effect of the on screen alerts and not the clearest thing to see any way. Can we please have a wacking (technical term) load siren/claxon/hooter/etc sound when the Invader incoming message pops up?