Hi :D once you figured out the controls, your game is cool. You level design does correctly the job to teach the player the mains mechanics. The main music is quite good !
Maybe you should consider the automatic restart when dying (because it's quite painfull to be forced to go to the menu and click on restart each time we make the wrong moove). Sometimes black blocks could stay in the air (LVL 5) which isn't very logical for me (or consider adding some floaty vfx around). LVL7 is a bit cryptic if you don't get that you could jump with the black block (but maybe it's intended). Apart from that, your concept has potential and could easily extended. Congrats for your work :D