Vampire help

I just unlocked lightspeed shots and now suddenly I die at the first vampire that shows up.

I did some research before posting and the best solution I could find is to buy target priority 2. I bought the tier 1 and found that the second tier requires 1B coins.

This will be a lot harder to save up for now that I can no longer handle vampires.

Is there a way to disable light speed shots? Or a good way to save coins? (I've been saving my coins for 2 days now and only got up to 120m, so it will presumably take about a week or 2 to reach it at this rate) also is there a temporary solution to vampires while I save up my coins?

I have yet to unlock super critical hits. Would it be worth it to unlock them first or should I just save up the 1B?