Thank you for the feedback! I've managed to fix the bug now, and it was more to do with when the item enters the player's trigger it sometimes doesn't register. I fixed this by changing the way items are picked up, looking for the nearest item in the scene rather than looking at items that have entered the player's trigger area.
Nice idea with the puddle, I'm going to play around with the game a bit and see what I can improve with it, so I'll keep that in mind! I definitely hope to make a post-jam version soon, so look forward to that!