Now THIS looks like something I'd play. I love the spinning mechanic as an offense. This is something I haven't seen used since Crash Bandicoot.
Gripping ledges with your teeth remind me a lot of Bonk and spin jump is a nice addition along with ground pound.
I have some problems however with giving the character a gun or any projectile for that matter. I think it'd benefit being a pure melee game since the enemies don't seem to pose a real threat anyway having patterns that are relatively simple.