Thats fair enough heading onto other projects, better than getting bogged down on just the one.
As far as other thoughts on how to improve this one I would give the player other things to manage and juggle while trying to deal with the spread of the mass. Drastically lower its speed to give more of that creeping horror vibe. But have the player have to go to their extractors to collect resources. And have those resources need to be taken back to the base to construct new extractors and walls and inhibitors. Maybe add another machine you can produce that acts like a placeable production center where you can bring resources to make the various enplacements.
Maybe add in an inventory limit for players to juggle with this. That you can upgrade to carry more enplacements at a time. Means you really would need to (as a player) figure out the right balance of gathering materials, running to base or to your production enplacements to make more things like walls and extractors and inhibitors, and generally give you more to do and get overwhelmed with. Just feels like it would fit the vibe you are going for here. Stresses the player out but in a way where if they use their brain and keep calm could lend itself to a really good grind as you manage to squeeze out maximal resources while balancing all of these factors.
Would feel kinda like the loop offered by the Biters in factorio but with all the extraneous things stripped out from that experience. Just you vs this force that won't stop and will only keep getting worse as time goes on.
Anyways, I'm dropping you a follow and I'm interested to see what you put out next!