The little platforms collapsing in on themselves made it difficult to jump and land on them. Some of the waiting between the jumps was a bit longer, at least for that first one. It would be nice to jump right into what the gameplay might be.
Regarding the limitations: game told me it would be WASD, but it was actually the arrow keys. yea... the instructions are a lie, but some games use both anyway. guess, it's a very literal interpretation of the limitation, so yeah, it's there.
But hey, nice submission. Good job. Fun, fun.