Really nice concept! This year's theme, 'scale,' was executed in a more creative approach compared to similar games! I also like the level designs because of the clever puzzles that utilize the growing and shrinking mechanic very well.
I think you could improve in two areas. Firstly, you could maybe work on your pixel art because it isn't as clean as in other games that I've played. Secondly, I found the game to be not that polished.
I really like the setting of the game, with the slime that seems to have been a failed lab experiment that escapes that lab. This theme was nicely visualized with the artwork!
Keep it going!