Nice concept! Sometimes it is kind of confusing why all the keys deactivate, but overall it's a pretty simple to start and hard to master game. Good job!
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Oh yeah it was probably the Alt key, sorry i didn't catch that while playing :D I noticed even the shift key does something to the keys. Maybe you could color them in a different way or let the player know in some way that they are "special" keys, like the space bar. Anyways the alt key is a nice touch now that i know it works :D Nice one!