No offense but it looks like a student project written by someone just getting the hang of using SFML and C++. Its not a game engine but more like a couple of

No offense but it looks like a student project written by someone just getting the hang of using SFML and C++. Its not a game engine but more like a couple of hours of bare bones SFML boilerplate code. Definitely keep working on this but maybe you should start asking for contributors when you're a little bit further along.