If you use WASD F-attack Space-Jump and Arrow keys R shift-jump R enter-attack you can play against yourself. I figured this out because no one would play with me anymore after I beat them too much. Tip:Don't beat your one friend too often at a game. he'll stop playing with you.

Who would want to play against themselves, I believe that they want a game mode specifically against a bot, OR made to be played alone.

Online or against a bot would be awesome. Even if the online is just vs friends that would be cool

I just downloaded and quickly figured out I could play by myself but I'd love for their to be a bot or maybe online capabilities. This game is so fun so far and any one of those two additional features would make this game even better!

Hey I made a singleplayer mod, you can download it here: https://borbog.itch.io/eggnogg-plus-ai-bot-mod

Also you can make both AI play against each other, which is fun to watch