Hey, thanks for trying it out and for the kind criticism, I didn't even think someone would actually play it. It needs A LOT of work and then a ton of polish. I did it in a rush with the very limited time I had during the week the jam was on, so I just aimed at making it somewhat playable, maybe I will make this a pet project and try to improve it over time.
And yes, the objective is just to spread and survive the slug and parasite plants, the poison kills the little plants that are right beside the mycelium and it also repels the slug, so it doesn't eat the mushroom if it's active. I wanted to apply some shader to the mycelium when it was active and do some animations when it kills a root, but I ran out of time