I really like the concept behind this game. The presentation is also really nice, especially the creepy music in the beginning. But I think the game is too easy. I think you should add more challenging elements later on, for example enemies that shoot projectiles that you need to dodge, or enemies that are faster and need multiple hits to kill.
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I also thought about implementing multiple hits to kill, but it was too complicated for me, I couldn't able to implement that so I left that idea. I implemented a progressive difficulty in the game, as you keep play on, by the time the faster enemy will spawn in the game, by the way thanks for playing my game and thanks for your valuable feedback