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Firstly we don't know where will the gates shift to, so at least you should find some ways to let us know that, for example, when the cursor points to a gate there is an indication of where will the gates shift to. Secondly, due to random impacts sometimes the particle didn't fall onto where we want it to. This is not a good thing, some modifications are needed. Thirldly, one-step undo is great, but multi-step undo is even greater. Lastly, as a matter of trivial fact, photon does not carry mass so it shouldn't fall like this.
Under rating threshold (hideshow)
Thank you for the colorblind option! It's great! I hate missing out on puzzle games just because I can't see the colors!
Under rating threshold (hideshow)
there are some very irritating glitches >.<
1. sometimes the balls would just fall out of their little bars on the right and you would have to reset to get them back
2. Sometimes the balls wouldn't go where they are supposed to, so you have to undo multiple times