I like the game idea you cooked up here, a sort of build-your-path platformer, very fun idea. I definitely appreciated the in-depth tutorial that showed the player how the game worked and laid out all the tools available.
Although, I felt the platforming controls to be a bit hard to play with when it came to jumping and maneuvering. One thing I'd like to see be implemented is some sort of indicator for where your block will be placed, that would definitely help with some of the more precise placements.
Overall it's a nice game, but a bit challenging for me. Keep up the good work though and great job!