Perhaps,if possible replace the black void with lava that would kill instantly?

I like the idea. Lava might look weird with the grass tiles, but it would work well with alien biomes.

I don't want to work on the graphics aspect of this, but alien biomes V3 has been announced and it might contain lava, so I might get back to it then.

got it,just threw an idea

One of the people who I showed this mod suggested indestructible rocks in place of the void. Maybe people don't like the void, it doesn't look that great.