I redownloaded it a third time, and it works now! I have no idea what happened differently, but apparently it works. This was really fun to play around with. I do composing work from time to time, so I'm familiar with drum machine plugins and found this very easy to use. The old A > E > AS > E sounds as good as ever (though I'm used to it being on the top of bottom keyboard rows, haha). Was this an 808 or a custom collection of drum sounds? The sound is pretty nice.
I received a "mixer not initialized" error on Windows and wasn't able to use the app. I'm not sure what happened. I tried redownloading the app and it happened again. But if it gets fixed, I'd definitely love to retry it.