Ohh I wasn't even thinking of adding more types, I think you have a good amount for a jam entry. I was more thinking it would be nice to have some level of discoverability/unlock feeling. Obviously at the start you can only make 2 types because you only have the green balls, so showing the other recipes is just sort of noise to the player that point. Then after your first run you have a new material type, and back at the cauldron it could show "hey you can make this guy now, here's what he does" etc. so you get a little extra dopamine unlock hit and can space out onboarding to better cement it.
Sorry I hope that clarifies, I wasn't trying to tell you you should have added more content or grow your scope!