Interesting concept :-) But, how does friggin' wall jumping work? I'm only a minute or so in, but getting frustrated already trying to get up that platform via the two walls close together.
Edit: Ok, I could've been more patient. Succeeded some times now. But I do feel there's lack of control with the wall-jumping. It's mostly just button-mashing I feel.
Also, got to the center boss and immediately got killed, because milliseconds after I entered I bunch of bullets came towards me, without time to avoid. Bit of a lame death. Might wanna fix that.
But, other than, had quite some fun!