Its kind of annoying to have to wait to heal after a heavy fight, you can mine Redstone but it only gives you Absorption. You can only wait or eat a golden apple, which also needs to be changed because its rare and doesn’t help that much at all.
This can also be changed by just giving a few hearts back if you get a kill, it wouldn’t do a lot but it would help.
Maybe even lower the amount of Absorption hearts to 3, but that might make the game less balanced to a less skilled player.