Ayyy, love a good post mortem ๐ nice write up! I had assumed you had prior experience tobe honest. I'd be intrigued to see your bullet spawning system - I put mine up for free for the jam - https://wayfarergames.itch.io/bulletfury
Your tips were all great too, though I will say that 4:44 is 4 hours to make the game and 44 to polish and add content ๐ planning is included in that sure but it's a game jam - you should prototype immediately. Planning is pretty much useless ๐