This is a really cool concept. I liked the feedback system and the audio/visual effects. I also liked that color filter on the shield and the bullets- it definitely added more variety to the gameplay experience.
Here are a few things that come to mind-
Controls
Let the shield rotate only with the keyboard inputs; don't rotate it when I move the mouse. Use the mouse only for aiming. (Generally, using fewer inputs for multiple mechanics is a good idea, but in this case, it is confusing and messing with the gameplay consistency).
Ship Movement
I could not figure out how or why the speed of the ship changed.
Regardless, it did not help much that the ship would move closer to the edge of the screen where NPCs would spawn and instantly shoot. You could experiment and check how it feels to have the camera fixed on the ship and move it along with the ship. This way the players would always have a relatively wider view of almost all sides.
Difficulty level & NPC
Too many NPCs spawned too quickly at the beginning. You may want to make the beginning a little less difficult.
You could set each NPC to have different bullet speed so that it would not be overwhelming when multiple coloured NPCs are on screen simultaneously. This could also help with better control over the difficulty level (the NPCs in the beginning would have slower bullets) and you could use different combinations later to control the level of difficulty and variety in gameplay experience throughout the game.
I also recommend having the NPCs be taken down in three shots instead of five when colour filter is not applied. When there are too many NPCs on the screen, it gets unreasonably difficult when you need to shoot an NPC five times while also managing the shield.
UI
My attention was fixed on the shield and the NPCs the whole time. I did not have the time to look at how many lives I had left. I would recommend implementing something closer to the ship to display this information.
Same goes for the Special Ability. I did not even remember that I had that ability. You could add something closer to the ship to make it better visible. You could maybe try experimenting with the colour of the player ship, or add a glow to it or something else to convey the status of the Force.
Try something more visual focused rather than numbers for displaying these two pieces of information.
Bug(?)
I think the ship randomly rotated to 0degrees on Z(?) axis and rotated back towards the aim. This happened twice, in different play sessions.
Btw I think you should add a different cover image for the game. The present one undermines how cool the game is.
Overall, it is a really nice game with super cool mechanics and juice. With further polish, it can be even more enjoyable. Great work!