Absolute MAYHEM :D I love it.  I think it needs a little more feedback for the player (particularly for getting hit) and maybe a bit of telegraphing for the enemy appearances to help with preempting the carnage?  It's good simple fun!

Simple game looks nice but you could have added some animations to make everything feel more alive and maybe a sound when the player gets hit but overall Nice game.

it should be wasd to move, it's really akward to use arrow keys and mouse

Very fun game, good job considering it's your first game jam! Well done!