Daily UI - 004 Calculator Animation

Daily UI challenges 004 Calculator.
I wanted to do something a little different for this challenge, so with a quick search around I decided I hated the look of all the tip calculators I could find. Here is a quick shot of the one I started designing. I'm considering getting it fully developed.

P.S. Sorry about the janky animations, I'm really diggin Adobe xd, but they seriously need to up their micro-animations game.