After finishing Robo Rampage, I gave myself a couple weeks to challenge my independent dev skills. I wanted to learn how to add a health pickup, basic SFX, background music, a double jump, and have a door open after a certain set of enemies were killed, unleashing faster and stronger enemies (this one took me awhile). I was able to do it! Pretty cool.
I figured out to get an itch account up and running: Feel free to try this nonsensical game out 