As a few other people and the page noted, it only works in Chrome. For Firefox, it fails when it tries to use chrome.storage. That doesn't even work in Chrome, as it's an API that can only be accessed by extensions. However, in Chrome, the chrome object is defined, so accessing chrome.storage just returns undefined instead of throwing.
It's kind of weird that it's using that when it could just use localStorage.
I came across a video yesterday about how Dead Cells uses a similar generation method (random composition of pre-designed tiles), as well as some other interesting UX hacks: https://www.youtube.com/watch?v=Uv5NwboDDhk
I love Dead Cells as a game (slick combat, great graphics and atmosphere, etc.), but it's levels are one of the weak design points IMHO. They are nowhere near as fun and interesting as Spelunky's. Dead Cells levels are just simple tree-like structure that branch out and have a bunch of random rooms placed alongside the branch. It even has errors where you get two checkpoints so close, they can fit on one screen. The only exception is level 5 where you have teleport doors that add some interconnections, but the rest of the game levels are meh. You start going down a side path and you know it's a dead-end every single time.
Looks like Derek Yu is hard at work on Spelunky 2, though no release data yet
Spelunky is like the Gold Standard of ProcGen in GameDev. It just works. Trying to apply the same techniques to Super Mario Bros might not. "Instant Death" and randomized exploration rewards seem to be key. This is a game that is probably impossible for an AI to master
OpenAI also recently released a ProcGen Benchmark that conceivably is used to explore generalizability in learning agents. A few of the modes look like they were Spelunky-inspired ;)
"Instant Death" and randomized exploration rewards seem to be key.
Usually called permanent death or permadeath. These two happen to be the defining traits of the Roguelike genre. They’re the two highest value factors of the Berlin Interpretation [1].
If you like Spelunky, check out Catacomb Kids. It's similar in many ways, but has fundamental differences such as no terrain destruction (by design). Check out youtube videos to see if it's for you. It's harder than Spelunky.
Caution: it's having trouble getting out of Early Access. Only two stages are complete, third is on the way and a patch comes out every month or two.
It's kind of weird that it's using that when it could just use localStorage.