Post Jam Fixes!

Just a small update to fix some of the issues that I didn't have time to address in the jam, and a bit more balancing:

- A lightling standing in the path of a projectile will no longer die if it's not the target

- Changed the popup info UI's location to block less of the gameplay

- Added a different, small UI for chest spawns to avoid info UI clutter

- The castle won't be overrun from one shadowling anymore, you have 2 HP now!

- You start with 50 less Shadow Essence now

- Added squash and stretch to menu buttons