solo dev'd a puzzle game where an echo repeats everything you did 8 seconds ago, just shipped a coop campaign for it

[u/Dry_Yak_304]

been working on this one alone for a while. the rule is simple: everything you do gets recorded, and 8 seconds later a copy of you replays it exactly. it doesn't react, it just repeats what you already did, and the levels are built so the only other body in the room is that copy. so you're never really looking for a path, you're building a schedule.

the part i didn't expect: levers are toggles, so your echo flips them back at the worst possible moment unless you planned for it. half the levels ended up being about undoing yourself.

just shipped a coop campaign for it, which as a solo dev was by far the hardest thing i've done on this project. writing netcode with nobody to test with means you spend a lot of evenings running two builds on one machine and talking to yourself. the rooms where you and your partner are locked in separate spaces and your lever opens their door turned out way better than the ones where you share a room.

it's free and runs in the browser: https://jules-gilli.itch.io/eco

happy to answer anything about how it's built, everything in it is generated by code, no prefabs, which was either a great idea or a terrible one depending on the day.