Thanks for the feedback! We were torn between using stats or general changes and went for general in the end to be able to make a quicker decision. Good point regarding the next enemy, an improvement we could do is maybe an idea of what is coming in the next wave entirely instead of a per enemy basis.
We could have been clearer regarding the base health, it is tied directly to your resource so you have to make a decision between building a new tower / changing elements or keeping some shadow power spare in case some enemies get to the base.