Dropping the first idea and restarting is a classic jam experience, glad you realized you're not actually falling behind! Making good progress is what matters. Also, don't worry about playtesters-once you have a build ready, hit me up! I'd love to test it (and I really hope you'll check out my game too).
I actually started with an idea I was afraid I wouldn't finish even in a month, but now I’m somehow on track. The hardest part for me is the art, because it requires a VERY SERIOUS amount of sprites and animations. But I managed to pull it off with some tricks-like copying objects and just changing colors or slightly redrawing them (honestly, that's meta, even the great Toby Fox did that). So good luck and have fun, buddy!