Of ideas and time wasting - more time wasting than ideas
Unlike this time last time in the compo, I actually have an idea of what I want to do. May I direct your attention to this excellently drawn chart:

Rails bullet hell with constrained movement where you take damage if you leave the safe path plotted out.
However, ideas can be a dangerous thing. I thought "If I make a Halloween game, my computer should be in Halloween mood." This is a dangerous rabbit-hole to go down.
In summary, I wasted two hours I could have spent working on the game, making a Halloween Windows XP theme for IceWM. Why do I do this to myself? I do not know. I share this so that you may laugh at my stupidity with me.
