Can't find APK install on Kindle Fire HD.

I got Little Inferno off of humble bundle and installed it on my Kindle Fire HD. Right after install it asked if I wanted to open. I chose yes and played the game for a while. After closing the game, I was no longer able to find the executable to run the game again. I used a file explorer to search for it and browse directories and I can only find the original APK file. So I tried installing it again. Again, I was able to play just after install, but once closing it I couldn't find out how to run it again.

Any help is appreciated.