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 :)

The puzzle like concept behind every fight was really interesting, I definitely liked the idea! The third level was hilarious XD Great idea over all! 

I don't know how to play

Its a pretty fun game! I feel like the game just felt a bit unpolished but its great other than that!

It's an alright game, pretty good for a first jam game. I think the big problem is that it feels very unfair instead of difficult. It's not easy to predict the boss' movements/bullets, and the movement is very slippery and hard to be precise so you can dodge. I'd also prefer holding down the button to shoot.

I do like the graphics a lot, though, they're very clean. I also liked how hovering over stuff changes the color, that's really nice.

Overall, it's very good for a first jam game, it just needs a lot of polish.

The shapes changing colors in the menu was a nice touch. I feel the controls is what makes it difficult. I suggest making it so you can just hold down the shoot button. Also, I had a massively harder time with the first level than any of the other levels.