=Lizard=
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A small suggestion for future updates, if possible: a quick upgrade function for creatures, i.e., the ability to upgrade them with a single click without having to open their window.
1. Double-click on the unit
2. Press "U"
3. Press "Enter"
If you get used to it, these 3 actions take about a second in total. However, I agree that it would be nice to replace point 1 with simply selecting the unit.