Congrats on finishing a game in such a short amount of time! It looks fairly balanced in terms of how much polish there is in UI, visuals, audio, gameplay and so on, which is quite impressive for a solo game.
In terms of gameplay, the various mechanics of the game make it so that the optimal strategy is to herd the triangles around the stage, all while mostly looking at the minimap (a harsh lesson after a massive triangle ganked me out of nowhere)... which is possibly not where the game is most fun at; there is not too much difficulty ramp up once you use this strategy (while faster and bigger, the enemies still pose little threat).
Another thing... I didn't like how the bullets felt; possibly a mixture of the shooting sound effect, their spread, and the lack of oomph impact on the enemies. Mostly the shooting sound effect though, which the player hears constantly throughout the game.
Still, it's quite solid as a game, which is quite hard to get in such a short amount of time. Good job!