Tried the alpha. It's quite good, i liked the feeling of the shooting
But regarding the wall-jump, you really should explain how it works in some way!
Basicly my experience was:
-ok, there are two walls that are too high too jump, let's try double jump or a jetpack by pressing jump button again
-nope
-pressing up?
-nope
-climbing walls?
-nope
-walljump maybe?
-trying it out super meat boy style, by pressing against the wall
-nothing
-trying the same things over and over but nothing works.
-maybe i'm missing some power up?
-go to the main menu and look for other levels
-nope, must be that one
-trying everything again
-made a total random walljump
-ok, so walljump is possible
-so how does it work?
-do i have to press jump, while hitting some ledge?
-nope
-figured out after like 2 minutes, that you just have to be near a wall
after that the game was fun
the difficulty was very high right away, but that's fine with me.
it was kinda cool, to figure everything out on your own, but at least some hint, drawn on the wall about the controls could be there. it wouldn't be a problem, if you used a "standard" way of walljumping, but you are using controls i've never seen in a game before without explanation.