Hey this is pretty fun!
I rated it highly.
Good points: matches the theme, executed well and nice level design. pleasant music choice! I'd like to play this again after the game jam is over.
To improve later: Add a little <--> double sided arrow to the yellow blocks to make it visually clearer to new players that these are the objects that can be resized.
I reset the first level a few times before I noticed that clicking the circle at the top right of the screen was the progress to the next level. Would be good if this could be done automatically once there are no more green orbs.
Making the second a little easier by giving the player 4 balls would help players get into the game a bit further. Setting a "par" system (complete the level using two balls for a star) would give optional challenge for more skilled players or full game replays. Level two was already pretty tricky in itself!