Hey, thanks for the feedback.
It's alright, this project ist 100% legal. I am NOT making profit out of it and Riot allows people to use their content, making fangames. As long as the content is free for everyone to play (no pay to play), they allow it.
"We love our players and the awesome stuff they create. We support players who use our intellectual property (“IP”) to create free fan projects for the benefit of the community (“Projects”). "
They got a new point in 3. considering Apps, but I already contacted Riot a while back, getting their permission.