net::ERR_SSL_PROTOCOL_ERROR Error

I am trying to start up the web application via playit.gg. So I’ve installed the exe file, started a tunnel and have got a free domain http://official-rhythm.gl.at.ply.gg:3365/ The problem that all static files (js scripts etc) give me net::ERR_SSL_PROTOCOL_ERROR in browser. It happens because of the some issue with http/https protocol while downloading this static files and I’ve no idea why is this happens. Locally my application works on http protocol, there are no links with https. So I am wondering is there some settings regarding this? How to handle it? Thanks in advance!