For a first game jam it's not that bad. It's functional, and you submitted it in time! And you seem to be the only dev on it, so it's really cool that you were able to make this. I like the 2D platformer Bullet hell concept, reminds me of Touhou Luna Night, and the boss rush mode of this game was the best part of it haha. Visually it's kind of basic, but it gets the job done, I always wanted to 1 vs 1 a triangle anyway. The UI is a bit confusing and messy tho. Adding music would have been nice, to make the gameplay feel more juicy. So yeah, nice start, I hope you'll make more jams and improve in the future :)