Oh, I see. I upgraded both the axe and the pickaxe and really noticed an improvement!
I'm sorry I can't help a little more, I couldn't recreate this "freeze", and I'm sorry if I sounded picky or something, I tend to pay a lot of attention to dynamism, but it's a point of view that doesn't really matter to most. Don't worry, you're making a great game!
Thanks and see you! :)