The concept is good, controls fine, but it was impossible for me to beat the game because of the occasional FPS drops (suddenly from 120 to 9). The idea that you have to notice the black holes from the way they pull you was nice, and probably works without the FPS drops.
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Thanks for the feedback! It's interesting, I haven't really had any issues with fps... would you mind telling me which operating system you were using? Additionally, please excuse the performance issues, I programmed the game from scratch using only a graphics library, and a few other minuscule libraries.