Version 1.3!

Only three minor changes:

- Performance Mode (or Low-Spec Mode) is now toggled at the Main Menu, and remains toggled if you hit ESC (or Start on the Gamepad) to go back to the main menu. Hopefully this will make repeated speedruns quicker.

- Performance Mode now also removes some additional effects like grass and rain splashes.

- All audio is now flushed from memory when returning to the main menu. We hope this will alleviate some of the slowdown some users have experienced on repeated runs.