[WIP] New input method: Draw a letter!

So far, the game has been all about typing on the keyboard, but we wanted to add more variety to keep things interesting.

We're working on a new mini-game where you can use your mouse (or your finger on mobile) to draw Korean letters, one at a time, to fend off those naughty birds.

Right now, due to some tech limitations, we’re sticking with drawing single letters instead of full syllables or words. So, when facing Seagulls or other word-carrying critters, you can draw each letter one by one to build  a word