Great use of classic Pipe mechanic games from the 90's! The graphics are simple and to the point, very sharp.
I felt that the learning curve is way off in the beginning. I think you could've approached the level design more like what was done with Super Mario World, for instance. Easy and steady. I see a lot more space for juiciness and responsiveness on the controls/player actions, like some form of highlight on the block that was moving or even show the player the possibilities around the area he is going.
Otherwise, great entry!