Everred is a mod of Celeste Classic that adds completely new levels, themes, and even a few features. There's also music remixes and new sprites. You should play Classic before playing this!
There's three routes through the game (Normal, Gemskip, and Trueskip) that you can take depending on which chests you open; however, the Gemskip and Trueskip routes require speedrun strats that aren't taught here.
Lots of credit to Matt and Noel from Matt Makes Games (https:mattmakesgames.itch.io) for the original game, and to the Celeste Classic Discord (https:discord.ggWgtDkq9) for all the help and feedback.