Love the sonar effect, lots of potential. The sonar effect is awesome, and the art style works well. There are lots of little things could elevate this game a lot.
Movement could be a lot more fun if there was some sort of thruster, or tail, to reinforce the direction of travel. Currently since I have so little information on where to go, I really want to know what direction I am traveling in. A tadpole style tail would work well. But even a trail would be great/help with spatial awareness. A long trail would help a lot with navigating, but if you are a stickler for limiting visibility, a short trail would reinforce the movement.
Better feedback on the collectables, I want to go out and get them, but currently, when I collide with them, I am not certain I really did, which when I am being chased, creates uncertainty, Rick hates uncertainty. a sound effect for collecting would make a huge difference. Next up play the effect of the collecting particles, scale them big(Lerp it like a pro) and fade em out, exaggerate it.
I want to know how many particles I have collected, and on my person. I dig the minimalist-ness of the current graphics, so in lieu of a text display, having the particles I collected orbit me or something to that effect would be nice. Its not clear that I retain them through death, this would fix that, as well as make collecting them further rewarding.
I don't think the enemy's should teleport, its confusing, by making them move normally the player can track their movements and better predict them.
Sound effects for everything, including music or some ambient loop.
Overall Well Done! I played it through to the second camera perspective. Very cool game!