Demo updated - browser FPS optimised

I've recently updated the browser demo with some pretty significant improvements. The main headlines are:

• Completely updated the pre-spiders section (spoiler) which now includes new swinging and climbing mechanics.
• Improved FPS with adjustable quality slider in the graphics menu.
• Improved the cable reel pull interaction.
• Re-jigged the front end menus.
• Created a new gameplay video.
• Added more narration by my wonderful wife, further explaining the game lore.
• Plants now have a reason to be harvested.
• Improved the games capsule art.