Thank you so much for giving it a try, yes the platform system was designed for click and drag. If you just click or tap they just spawn on the grid and it can be a bit imperfect with rounding and yes they can overlap, I allowed that as I had playtester friends drawing goofy art with the platforms that was helpful for.
I'm really happy with the platformer controller too, it was written from scratch in ruby, was my first time making a platformer in a framework and not having help of an engine like Godot or Construct.
Thank you so much for playing and I wish you luck in the jam too 🙏