Tips to Beat Biker Boss
For my first few encounters with biker, I found thatmovement speed (the engine) really helped me, and weapons i didnt have to aim with (parasite, wings, static signal, etc) so i could focus on dodging the bullets. Once you get used to the patterns, it gets easier with other builds because you’ll know how to dodge the bullet patterns.
Here’s a tip with movement during this boss: focus on moving diagonally, and ALWAYS be moving. For most of the fight, regardless of what the biker is doing, there will be a bullet fired from the top/bottom/left/right of the screen at the same time aimed at the center of the screen (your location when the bullet is fired). If you make a point of moving diagonally in any direction while this is happening, you can avoid most of those bullets.
Where this gets tricky is during the portions where the biker is trying to ram into you (like phase one), when you see them coming at you, move in the same direction the biker is moving (ie: if moving towards bottom right corner, you also head that way) and when they get close, change your direction slightly so the biker passes you by.
During the phase where the boss is doing the circular pattern, I just move very far away because that pattern remains stationary while the fight continues, if you have a directional set of upgrades this is where you can aim your attacks in the direction of the boss while you run away.
During the phase where the biker is zigging and zagging around, this is good for builds where you need to be close by (chain belt, slime spikes, horns, etc) because you’ll be close briefly and you just need to make sure to move out of the way when the biker changes direction.
The 4th phase where the biker jumps off the bike focus on paying attention to where the boss is flying around… but keep in mind that the hitbox is PROBABLY just the bike (unconfirmed, but that’s where the hp is located, but both the boss and the bike hitting you will hurt).
Good luck! Hope it helps.