tutorial is broken, it stops working after it assigns you to see how the pacemaker works with the muscles in the brain
It could definitely be better signposted, but that's the end of the tutorial.
That's... Not even really a tutorial at all though? That's like, at best, a test to see if your mouse works.
? that's a fair bit into the ways of tutorial. You've made a full body and swimming animal at that point. There seems to be a bit of a disconnect between what we're seeing here.
