Just incredible. The MML visual style is nearly 1 to 1, yet the game as a whole has it's own charm and identity that separates itself from being too much of a direct clone. The movement feels great, although I feel like the mid-air dash should launch me horizontally, instead of downwards. Dashing is also smooth and works well, but I found myself constantly holding shift thinking it would put me in dash mode (old habit). Everything else is simply perfect, from the character models and textures, to the environments and enemy design.
One other thing I want to mention is that if you press 7 on the keyboard, it launches the character into the air (a debug function I assume) and you can bypass a lot of content. I just wasn't sure if that's something you intended to leave in the current demo!