Hi. It's the first game I play in the game jam. And I really liked it. Here's my opinion.
(Also I'm sorry if my english is not perfect, I'm french)

Goods:
-The graphics are pretty good, it's simple and it's in the mood of the game
-The music is cool too, it fits well to the ambiance (did you do it yourself?)
-The Bullet time effect is really cool, the slowing down music and environment is a very good feedback
-The concept itself is pretty good too. It's "deja vu" but the infinite loop rotating add more dynamism to it
-You created your game with Godot (me too), and it's cool to see that with exactly the same tools, we created completely different games

Things to change (in my opinion obviously):
-I feel like the bullets of the player are too slow, maybe you should speed them up, like it's a laser-gun or something.
-The triangles are too fast at the beginning. Maybe you should slow them down, and the more you play the more everything get faster.
-There are not enough "true" enemies (the big turrets), I think you should make them appear more often.
-The score is not enough dynamic. I think each triangle killed should add +1 and each big turret +5 or so... To force the player to kill enemies to have a greater score, and not just wait and kill only the "needed" enemies that goes on you. Also, the score doesn't stop increasing once you're dead (I did a score of 130 and then it gradually became 138).
(Maybe the solution to this (in Godot) is to make a "dead" bool that become True when you die and in your _process(delta) you don't do anything if dead == True. But I'm not a pro at all, you can find other solutions.)

Generally:
It's a really cool game with a simple but efficient concept, and a pretty good artistic direction, but you can make more. (sorry for this loooong message)