I left information about how to play on the actual game page, didn't realize it wouldn't be reflected on the jam entry. I'll repeat it here:
In this game, you defeat enemies by drawing and enclosing a loop around them. After a certain amount of enemeis have been defeated, you may purchase upgrades from the shop to increase your character's strength. As the game continues, it gets more difficult with more enemies spawning, and different varities appearing. The player has a punch move they can use to stun enemies while moving to assist enclosing a loop around them, enemies with shields must be punched before they can be defeated.
Controls:
Movement: Arrow keys or DPAD/Stick on controller
Draw Line: Hold Z or Primary Button on Controller + Move
Punch: X or Secondary Button on Controller
I only tested controller support with a Dualsense, it works far better than playing with arrow keys - I didn't test other methods.