Small fixes for Version 0.3.2!

Made a few changes post-game jam to improve the game feel and experience for more players.

• Spike hitboxes are more forgiving now and should be easier to avoid, especially on level 3.
• Added a splash screen advising about possible photo-sensitivity issues and allowing users to turn off the animation effects. This continues to be toggleable from the settings menu, but I realized that the setting should probably appear before users even start the game.