Interestingly close to my idea, but a much faster paced execution. Its fun, but gets difficult very fast. Sound and music are missing and could have added a lot. It would be interesting, if you had some variation in level design as well, but I like the random spawn of the crystals. Theme & limitation are well included.
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Thanks for the reply! I agree there's room to grow in terms of difficulty tuning and level variety. I planned to add a variety of enemies and resources as well but there are only so many hours in the day :) I did include some rudimentary sound and music, maybe they got lost in the build process but they're captured in the video. I'd love to check your game out as well.