Some kinda combat system. Move with WASD or arrow keys. "Dash" with the spacebar. Swing by left-clicking. Defeat all the enemies!
Based off of this video by @griffpatch : https://www.youtube.com/watch?v=d1g1SRksKdw although I did not follow any of the tutorial, and just made it myself (so it's not anywhere near as good lol) Also thanks to @griffpatch for a high-level overview of scrolling worlds (specifically the RPG tutorial) :D