Thanks for the feedback!
I agree with the difficulty curve being off, causing hard gameplay. Was a result of me not having too much time to go back and change things.
As for the tower cooldown being reset when a tower is selected, this is due to a potential "cheat" I imagined being quickly switching between towers to fire them, hence totally skipping the cooldown. But I also see your side of the feature. Perhaps there is a better fix.
I suspected that this cheat was the reason for the cooldown because it is the first thing I tried to do on my second run :-D if you think about it as being a mechanic then you can balance it an make it somewhat mandatory to use to combat the high difficulty curve ;-)
For time, I keep a log of previous game jams to help me improve, it's not perfect but so far it's helped me keep organized before each jam: https://github.com/foxtrot-roger/game-jam-stuff
