It's okay. Have to agree with others that either "wad" buttons for movement or even up as an alternative for jump.
Bug report:
There's a damn mosquito in my room. (lame jokes over now...)
others have reported this but resetting cause the song to start again without killing previous song so holding "R" makes you feel like you're in a slowed down, twisted reality.
If you're quick enough you can run off an edge and grapple the ledge inverted (so you're character looks like he's holding on to thin air instead of the ledge). doesn't affect anything other than looks.
You can grapple the inside of a crumbling block so falling isn't an issue. (there is a chance that my character grappled onto the block next to him but was inverted so it looked like he was holding to the outside of nothing.)