Is this Android app i installed for Openwrt safe?

http://www.openappfilter.com/

https://github.com/destan19/OpenAppFilter

Wanted to try it out for easy to use parental controls, haven't seen many people talk about it and I want to know whether it is malware as I installed it​ and connected it to my router but the link on the website to the apk is linked to the website itself and not github fdroid or play store. Do I have to reset my router or have other people used it (aka is it safe?). I wouldn't have installed it at all but my dumb brain thought "eh its fine its got over 2k stars". I disabled the app quickly after connecting it to my router out of concern but am wondering whether the damage is done.