I really like the graphics, the creepy temple with octo-baddies and whispers. The little plumes of dust on the ground was a nice touch. The combat and movement are simple enough, but still had to dodge around things and pay attention to the enemy placement or you get attack from all sides! So it added a sense of danger around each corner. I especially loved the 'bullet hell' style boss (I did something similar in my entry, you should check it out) at the end.
Not too much to complain about and after reading this is your first game and first jam, I'm impressed! Great job!