I want to credit a couple of sources for this game. First is Lazy Devs and Krystman for his fantastic shmup tutorial. The title and boss music came from snabisch on itch.io, who has some incredible PICO-8 tunes available for use.
This plays as a fairly standard shmup. Shoot torpedoes with the O button. Enemies can drop life preservers. If you collect at least 5, you can press the X button to release an anchor that damages enemies. If you collect 10 life preservers and are missing a life, you will receive a 1up. If your lives are full, you get additional points.
There are two different types of bullets that enemies can shoot at you. The standard "bubble" bullets will do 1 hit of damage to your sub. The electricity bullets will temporarily paralyze your ship, but won't do any damage themselves.
My first attempt at creating a PICO-8 game! It definitely has room for improvement, and hopefully by working on more projects, I can get there. But first, I definitely want to credit some folks.
The idea for this cart is based on a submission for the 2018 My Famicase Exhibition by Rutherford Craze. The exhibition is a call to artists for box art for fictional Famicom games. I used the box art and provided description of the "game" to help craft this cart.
Here's a link to the site with every submission for 2018: https://famicase.com/18/index.html
And a link to Rutherford Craze's website where the process of creating the box art for Nominal is detailed: https://wiki.craze.co.uk/nominal


