This is a nice concept you guys have.
As player I had some problems with the keyboard gameplay, there are too many buttons in different locations complicating the gameplay. i'm a terrible platformer gamer, but the yoyo mechanic is a pretty cool touch to this genre.
Some of the features, like the slow and the parallax enviroment, need more "juice" and feedback to the player.
You need to implement the audio ASAP in order to achieve a whole inmersion in the atmosphere you created here.
Go for it!! Can't wait to have the whole game published.