This is pretty much brand new software and is supplied for free, open-source. As such, it doesn't come with a warranty of any kind. Still, if you let us know when formr causes you trouble or headaches, we will try to help you resolve the problem and you will get our heartfelt apologies.
If you're the technical type (or employ one), you might consider hosting a stable release of formr yourself, because this version of formr tracks the most recent pre-release and will thus sometimes have kinks.