Great puzzle game! The random spawns of the enemies are a really smart choice, as otherwise you could do some really exploitative things to get virtually infinite score. It feels great, there's a lot of strategy and it feels really rewarding to look ahead several steps and have your plan work out. One thing I didn't like at first was the idea of "parity": for example, if a ghost is 2 squares away from you, then there isn't a good way to kill them. But after a couple tries I figured out how to deal with that by placing "throwaway" blocks and running into the blocks I had just created and the parity became a really interesting obstacle to deal with.
One missing thing I'd personally like to see is the means to "go infinite", since currently walls trap you in more and more and you'll always eventually lose. Since it's a turn-based puzzle game, I'd also consider including an "undo" feature in case players mistype something.
The sound is way too loud (and scared me) when the candle enemy killed me, though, so would be nice to turn that down.
These are small complaints though and this is awesome work, esp. for high school students! In terms of design, this is probably in the top 10% of games I've played.