Javascriot Sonic engine, originally on https://gvbsonic.glitch.me/

It also supports static website's. That is if you know how to do a HTTP server, or host a static website.

Multicharacter support - customizable for everyone to have there own signposts.

Working menu and title screen - customizeable for everyone that likes to do stuff with engines.

Built in level editor - for creating your very own levels.