Thank you so much for playing!!!
So with the 'Q' button, you can use the boomerang ability; if aimed correctly at the enemy, it will lock on, and the boomerang will have the same color as the enemy. This boomerang, once it hits, will set the enemy to a neutral color, meaning you can hit it with any bullet you like.
The good thing is, this will actually be good for your combo multiplier, providing more damage, overall points, and bonuses on health/shield drops.
The negative of this ability is that any bonuses potentially earned from hitting this enemy with the right bullet will no longer drop when they are set to this neutral state.
If you give the game another go, let me know how you get on!