Fun game! I liked the light casting effect, it looked super clean and added a lot of intensity to the game that I wasn't expecting. I enjoyed how you could see the eyes of the enemies through the dark, that was a nice touch and helped a lot with strategy.
If you wanted to improve, I suggest adding some additional sound effects, such as for when the spikes go up and down. Several times I didn't notice the change and would just stand by it waiting for nothing.
Overall a nice game!