I find the game enjoyable to play, and a catcher/dodger game is a very good idea to make a first game. the gameplay is fairly enjoyable, the sound design is fine, and I like the score system! However, I do think the way the art was handled in here needs alot of work. I think you should learn pixel art (its easier to make look pleasing and do quickly), as a uniform style would make things look drastically better. You should probably mess around with pixel art programs (like aesprite and pixilart) and watch some videos that help beginners. Although, you should know that it will take a while to learn art, so you might want to team up with some artists in the near future.
I also thought the game looked kinda mismatched. I think the setting could made more sense by being a jam factory, and a malfunction there is causing the jam fallout.
Finally, in a post-jam update, you could add power-ups (ex. a shield that protects the player from one of those toxic jams) or enemies (ex. toxic jam monsters walking from one side to the other) to spice up the gameplay.
Good luck on your journey!