The game has an idea but doesn't help the player achieve it in any way sadly. There is no way to know the size of the level or to know where you are (a minimap could help maybe)? 

It was only after playing the game 5 times that I could figure out what the red blocks do, or how the "bubble meter" depletes. Some cool additions that would improve the game is a pause menu, or something to restart the level, or having the "jump" button on Space like the usual conventions.

Congrats on finishing the Jam and good luck for next times!

Do you mean that you need to get the cubes in the same place to win? If that's the case, the size of the level makes it hard to get a sense of how to do that.   Made several jumps that I didn't know what was at the bottom.