Hello, I like the game idea, it reminds me of some old flash games that I've used to play on the web browser long ago.
I'm guessing it was designed for mobile due to the portrait orientation of the window, which is fine. There is one thing that makes it harder to play though, there are some baloons that spawn halfway out of the game's window, and you only see half of it. Usually mobile phones have protective cases on the screen edges, and that would make it difficult to press those. Try having a margin on the screen borders that doesn't spawn objects, it will improve a lot the gameplay experience.
Also, think always as if the player had only the game without the website. In past jams i've had people download the game without checking anything other than the images, and then hitting the download. That's the reason of why i always include a introduction/tutorial or something similar to that, which guides the player into how to play the game and what it's about.
As Grisgram mentioned, designing the game's page is something you should definitely do, my tip for this is to consider it as part of the jam, even if you put a placeholder/draft and fill it out later to familiarize yourself with how to present your game to people, and also get familiat with tags and such, which also can bring people to your game.
-Most jams if not all allow to modify the game's page, just not to upload game changes/updates. So in example if you had a empty page you can modify it with the description, credits, teammates, and so on.
I encourage you to visit the top rated games in the jam as i believe that could help you with that.
It's a fun game, good job! :D
PS: I hope you don't feel overwhelmed by the wall of text, lol.