This guide will be completely useless to all the big brain pro gamers out there but i struggled on it so for epic people like me who can't kill giant virtual bats on the final level of the first chapter, here you go.
1. You're gonna want full health. You've just hit a check point with multiple hearts so make sure to stock up.
2. this bat doesn't have very much health, but is a great attacker. Keep firing at it
(finally)3. if the bat get's to close Roll, it can't hurt you if you roll. I would recommend going to the end of the screen

I hope you found this guide useful, and good luck on the adventures ahead