Many people are far too picky and have expectations out of line with the rest of the world when it comes to software. Ignore those. There are plenty out there who will happily part with $3 for some entertainment to share with their pet.

You will never please everyone.

I've used other keyboard locking tools in the past that were free. What I'd really love is a smarter app that detects keyboard mashing or whatever so I don't have to manually lock/unlock when my cats come around.

Does it need an app? "Make noises to shoo away the cat" doesn't seem a killer feature, but good luck with this release.