Congrats on doing your first game jam! I think it's very common for game makers to be overly harsh of the things they make so don't sell youself or your game short.
As for the game: Glad you enjoyed it! To answer your question this whole game was really tiny, and made mostly from code and parts I'd used in other games. So given all that I think it was done in maybe 3 hours? That's lucky, I tend to have very little time to spend on game dev. I wish I had more time to polish and refine it, because I find the core concept really fun.