Thanks for playing ^^ the invulnerability while looking at the map is intentional, it was done just as a quick fix for unrelated issues, ideally I'd have something more thought out and robust.
Yeah its not optimised very well, my friend also had lag problems playing on a laptop, specifically in the cave. Its just a case of it being rushed together because of time, and I think its probably the water physics that cause the lag, there are a lot of spring joints active in every scene, the cave scene in particular has the most by far.
Jumping on the parrot is actually quite rude, but glad someone found it haha, thanks again for playing, and giving feedback! :)