Thank you very much for playing! I'm glad you liked the polish in it, I'm also surprised we got such a nice product out in only 3 days.
The audio feedback for maxing out your chain is in the code, but it's buggy and doesn't work properly yet. Aside from fixing it, I plan to add a visual indicator below the player when your chain is full too. Maxing out your combo before bombing is the intended play strategy since it allows you to get maximum value from the golden point items (10000 x 64 = 640000pts each), but sometimes you'd want to prioritize quantity over quality and cash in a lower combo on a large horde of enemies (as opposed to a max combo on a sparser wave).
Yes, fairy maids.
Once again, thank you for enjoying the game!!!