Great game!!! Quick suggestion, begin cooldown timer when ability is activated, as opposed to when the duration is finished. This would just make the abilities all work better togeather, as they would come off cooldown at the same times, as when you could use the 5 min ones twice, and the ten minutes ones once, and not having to wait 15-30 seconds for the 5 minutes ones to be on time with the 10 minute ones.
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its a very nice idea. But we have already plans for it ! It will surprise you !