For starters, good concept! these sorts of "pile up" games have been a thing, but very few have a distinct goal in mind (i.e. getting across).
Only issue is that the map seems randomised. now, this isn't a bad thing by itself, but since you have no indication of where the falling blocks will freeze, you can get stuck making leaps of faith very quickly. also, since jumping over the roof can kill you, if the game spawns a high path, you can get locked out of ways to go quickly.
As you said though, since this is a prototype, don't take this too seriously. With a little refinement, this could be a really cool game!