Thanks for playing, we're glad you liked it.
Yeah, we noticed that issue with the background glitching too. I didn't code it myself but from my knowledge, it's likely an issue with the shaders we used in the background that help them scale dynamically but also allow the worms and ants to dig tunnels. When I talked to the artist that coded it they told me it should be an easy fix as they encountered it before. The bug just didn't pop up for us till we expanded the level size and by then it was too late to fix.
Is one of the fixes that will be implemented asap!! Thanks for the feedback :)