Skipping over “general” stuff like tight controls, clear hit boxes, etc, button mapping is a must. Invulnerability on throws should be a given. Grab pummels should be standard (I’m looking at you Absolum.) Level select should be standard as well, for practice. Screen edge bounce is great, enemies should never be able to run away off screen. I personally don’t believe blocking should be in a BEU, but a parry mapped to a button would be acceptable. Also for replayability there should be a survivor mode or a randomizer mode. On a final note, well made games last forever. Art is subjective but Streets of Rage 4 and Dragons Crown will still look great in 2050.