I never developed on construct and i don't know if you can control time there, but what you could do is another variable that starts at 1 and loses 0.05 per tick, when that variable reaches 0 then you substract 1 from the score counter and put the time control variable i've mentioned to 1 again, keep in mind that framerate (tick calls) can vary depending on the users computer ^^ Sorry for that long text, of course i enjoyed your game!
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Thank you for the suggestion! I'll keep that on mind when making my next game, or maybe for a re-make of this game. That's actually a smart idea and I hadn't thought of that. Of course you can control time in here, so I'll definitely use it for further proyects. Also, don't worry about the long text, I wrote bibles to a poor soul some 5 comments below, lol. Anyways, glad you enjoyed it! I just played your game and its awesome too. Plain epic.