I am just an individual developer who develop some useful tools in his spare time, so sometimes the bug fix may not timely. But for critical bugs, I will try to fix it as soon as possible.
Currently you can reach author through email. Twitter, WeChat, WhatsApp etc are still under application and will be updated later.
The best way to suggest for new features is just leaving your message in the post and I will check them from time to time.
u might also try a plugin to add a contact form.