Short little play-through, but it was a good time. I like how fast you can play through stages with the fluid movement, the sound effects were well picked and the track is fitting. Nice pixel art.
Some minor nitpicks:
-The stage select screen should highlight the stage you last completed when you return to it.
-What's the point of having the green diamonds if your progress isn't shown on the stage select screen? You should have some way to indicate if a stage was completed 100% or not.
This should be developed further. Definitely has potential. Maybe you could come up with more gimmick blocks to introduce in further stages?