This is an example of what can be done with the Zero Engine.
There's much more this little engine can do since it includes a powerful system of Finite State Machines, Universal Input, and a Universal Physics engine or two. You should give it a shot if you're wanting to create a fancy RPG game or just a simple platform game with creative level design.
The platform engine even includes moving jumpthrough slopes, something you won't find in any other platform engine available for GM.
So give it a download and see what you think. The editable gmk is here:
http://gmc.yoyogames.com/index.php?showtopic=454506
Btw... those water animations aren't sprites...