the content will be 100% custom, except the music/ambient.
Well, that sure makes sense.
If this is just gonna be another Gaia, I say ugh. Hopefully you plan on making something more substantial. Big is not always good, but it can be made to work if you manage to find a way to keep the player interested.
The name "KnyttPath" makes me think of the game Knytt. Knytt was 'big' if you compare it to KS levels, but if you're gonna clone that that's no good either. I'm probably reading too much into that though.