Thank you for the feedback! For the rune system, I attempted to make the runes seem out-of-place compared to the more modern-looking tanks and setting, but I do understand that it could be more intuitive. The new game plus mode was more of something to give maybe a little bit of fun for the player upon completion and with the way I structured the project took about 5 minutes to implement haha. Maybe I should cut out things like that and stick to only the core gameplay next time.
Thank you again for the feedback as I believe you are the creator of the pirate tower defense game that I had a lot of fun with, definitely top 3 favorite of the jam. Your feedback means a lot to me!