Based on feedback I've been able to improve loads of things, I'm fully expecting to be able to get to version 1.0 next week once I've finished the Clockwork Demons. Here's what has changed for version 0.8.9:

• Fixed boiler without safety valve starting to break down halfway through green instead of yellow,
• Fixed a toy starting to run around when picked up from the belt by the player,
• Fixed being able to throw coal into the boiler through the boiler door,
• Added machine sounds for more immersion,
• Adjusted the volume scaling of the lineshaft and machine sounds,
• Made boiler fire and boiling sound a little louder,
• Increased breaking chance for machines on day 2,
• Machines are guaranteed to break before 2AM if they haven't already,
• Competitors are guaranteed to spawn before 2AM if they haven't already,
• Lowered Competitor spawn chance in days 4 and 5,
• Competitor now makes a sound when spawning,
• Added different sounds for Competitor retreating and killing,

Let me know how you like the changes :)