Good job, love that sprites changes then you die. The only problem with it is, it can be hard to see what is a platform, and what isn't.
A good use of the mechanics, with the spawned platform and the boost.
I have some small thing to think abour next time:
I spawned to close to a intant dead, what i died many time then I spawned in.
The boost power feels random at times, especially in the air.
Then you save the player life, mabye make a min life they get back. I stoppede in the Add block area, because I only had one life, with maked a hard area harder.
But its a really good