I'm going for a game where you need to collect items to summon the final boss of a level. Once you defeat the final boss, you can advance to the next level. I've created my own sprites and sound effects. Thus far, this is the progress:

https://youtu.be/WpzY-nBbywU

The major thing I want to focus on tomorrow is level advancement (I need to figure out how I want to handle making the game more difficult as you progress, and implement the logic to load a new level). From there will just be polish. More enemies, different weapons, different kinds of items to summon different kinds of final bosses, etc. We'll see how far I get! I'm focusing on the basics first so that I can have something playable to submit.