It's really good. Levels are interesting and mechanics are useful. It seems simple, but has so many details. But it's too hard for a web version, cause my Fps was low. You should make it a full game. Good luck :)
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Yes it currently relies a lot on post processing effects, which probably was not the best decision. It played fine on my computer in browser, but I have seen others play where it is laggy as well. I will look into that in the future. Maybe release a downloadable version or tone down the post processing and find a compromise.