I believe those are printed when the game closes. I read up on it a bit--your OS cleans up any leaks on its own. Lucky me!
Edit: Anyway, that looks like an Engine thing. I wouldn't know where to begin to fix that
That tracks! For most code in the game, I have reduced a lot of instantiation of nodes, which is creating new nodes. The bar animations have yet to be converted. I was going to implement a better, tween-based animation strategy instead of creating new nodes out of the suspicion that it is bad on performance. I'll bump that up my priority list and reply when it's uploaded