Cute game! I think I haven't really noticed the upgrades after choosing them, like "vampire skeleton" or "skeleton with a sword". Are the chances of they actually do something very low, or did I miss something?
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Thanks for your feedback!
For the question : when you take an upgrade who can give skeletons new capacities the future skeletons you resurrect have a chance to have this capacity and this chance get bigger when you increase the upgrade's level.
The first idea was to change the skeleton's sprite to show its capacities but, because of time, I couldn't make it.