Eventually the game slows down because of Glorp count, and that's fine because it's a jam game. Since your planing to work on it post jam, an easy solution is to cap glorps at reasonable number and have buildings that upgrade glorps or gives them tools.
Viewing post in Glorps Galore jam comments
One of the biggest problems currently is that the pathfinding is very expensive. Optimizing that should raise the cap quite a bit. I also wanted to add some more bottlenecks/prerequisites for spawning them in the first place, e.g. needing to generate electricity or food or meeting other requirements.