I like the slippery aspect of the controls because it takes practice to get the hang of it.
The only thing I do not like about the controls is that I am use to w,s,a, &d for movement, and using my right hand for shooting.
So, everything was backwards for me, and I had a really hard time getting used to that setup.
I tried to go up the first ladder, but it went down when I hit the up arrow and did nothing when I hit the down arrow.
It went down into the ground, than I was stuck and could not get up or out.
Maybe it was a glitch or something, so I will try again.
EDIT
Not a glitch, definitely a bug.
I refreshed the page and that first ladder got me again.... went down into the ground when pressing the up arrow key, and down arrow did nothing.
Second ladder did the same thing, so did the last one, so I could not finish the level.
Using Windows 7 and Firefox browser
Coding things my way since 1981 -- Currently using AppGameKit V2 Tier 1