Very interesting demo! It retains look and feel of NES Mega Man fans, while also incorporating signature mechanics from the games levels are based at. I was surprised by non-linear structure and keys in Link level or by ability to stomp enemies and dive into pipes in Mario level. Those are great additions, which really help to create feeling of Mega Man "visiting" different game worlds. I haven't encountered any bugs or glitches. I am looking forward to more levels!