Use the arrow keys or WASD to move. Your goal is to defeat the boss at the end of the game. To talk to NPC's (Non-player characters) by pressing space. When you enter a battle, you can choose what to do by pressing the different buttons shown in the bottom right. When trying to defeat the boss, I'd recommend being at least level 6 or 7. You can level up by defeating slimes. When you level up, your damage and HP increase, but the power of the slimes do as well.
Requirement checklist: More than 2 sprites more than 2 backgrounds Movement types: spinning and walking The slimes have the color effect on them and the flashes are created by the ghost effect