to move hold the left mouse button, right one sends a little fish out like a torpedo.
the terrain is generated while you play, and the canvas collision mask isn't updated until all the grass is created.
i think i'm pushing the construct game maker to its limits with my level / canvas sizes, i noticed if you make a canvas with a width larger than 8000 it tweaks out bad. and the collision mask is all types of messed up. it makes me sad, because a lot of my ideas deal with a scope of this scale.
i'm currently messing with zooming in extremely close, but that makes the canvas collision mask impossible to work with.