Hello, fluff!
This will be mainly if you're using a windows computer as I'm not too sure on Mac. To uninstall, all you need to do is click the windows symbol on the taskbar of your computer. From there, type in 'uninstall' and a menu called 'add or remove programs' should pop up. Scroll down until you see 'Feralheart'. Click it, and then press uninstall.
Next, go to where your main Feralheart file is located. This will usually be in the C Drive on your computer. Just delete the whole file.
From there, you're free to install the game again ^^