Yea mouse support would be nice :/ But anyways are you able to tell on what the possible interaction issues were? Currently the only ones i know of are "Keyboard rollover issues which causes specific 3 key combinations to be unpressable" and "People not realising first two buttons need to be held down not just pressed". Anyways thanks for the feedback!
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So I have tried typing the keys that are next to the variables. I also tried holding them down as you stated. But it never lets me alter the value. Because I can not alter the value I can not adjust the strength of the tower. Which fundamentally defeats the purpose of the game as you outlined in the description. Perhaps there is some browser limitation here. I am not sure. Though I kind of doubt that being the case I see it tell me which key is being pressed and or held down.
Could have some causes:
Color does not match: green=tower,red=enemy,blue=tower
already something else inside, if its not grey, it cant be added to, you can use debug mode to click on the ONE key inside the code editor to remove it :)
and also could still be keyboard problem perhaps, the keys gotta be pressed like, HOLD the first two, example; "1X" then let go, and you have 2 seconds to press the final key, example: "Y" so all together itd be like 1X + Y