One of my favorite games to play with friends or alone is Risk of Rain 2. It’s a 3rd person co-op rogue lite.
One loop in the game is the item exploration loop for each level. There are a number of item drops of varying rarity on each level, randomized in location that you must explore to find, even though the map itself stays the same on each respective level. There’s a small loop of finding a single item, clicking “interact” or making a decision on which item to get if its a shop, then receiving the item and deciding whether to pick it up based on what you already have.
One arc in the game that was added after the game’s release is the escape arc. After getting strong enough, you have the option to fight the final boss and escape the alien planets you’ve been exploring. This sense of completion gives the player a sense of story climax/conclusion as they are able to test both their skills and their current run’s character against the difficult final boss.
Some other loops and arcs in the game are mechanics like permadeath, bosses, item loadouts, and more.
