itch.io

a thing I figured you can do too is just tapping tiles around the dragon until you break the egg. I usually want to kill 5 HP worth of enemies, level up, 5 HP again, level up, then 6 HP and level up, then the next level requires you to get 9 XP with 6 HP. The egg gives exactly 3 XP so you can level up a 4th time without scrolls nor relying on chests

yeah as the other guy said, you need to prioritize a lot the XP that doesn't damage you (and the 10 dmg enemy that gives a net total of 37 XP)

it may sometimes be risky but most of the time you should be doing good by following that plan, usually you'll have like 2-4 health scrolls most of the time

did you make sure to only level up when at 0 hearts?