[SPOILER] Stuck on the Slime Boss? A couple tricks that helped me:
1. Split the small slimes up, don’t juggle both at once.
When the big slime spawns two smaller ones, fully finish one (including anything it spawns) before touching the other. One at a time gives you way more control over your timing.
2. Use your invincibility window to eat multiple misses as one.
(If you’ve got 2+ hearts) Once you lose a heart, you’re briefly invincible — and during that window, a second miss won’t cost you another heart. So if several (or all four) small-slime gates are about to close on you at once, let them all close together during that invincible window instead of panicking to save each one individually. You’ll eat it as a single heart lost instead of two or three.