Neat concept, but the game moves at a glacial speed. It also seems like there's not a lot of choice in your upgrades as the cost seems to scale exponentially so you're pretty much forced to upgrade everything which makes it seemingly impossible to lose? I'm not sure. Something bugged out on me around wave 30 where I seemingly got way more souls than I was supposed to or the cost of certain upgrades actually gave me souls instead of took them away and I was able to completely max some upgrades. I think this game has huge potential.
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Thanks for the feedback. I had a bit of a struggle with balancing the enemy power / upgrades so turn off a function to add speed up to the enemies over time. The bug with the souls count is annoying me, its all down to converting the value to 1.1M etc. to save space.
Glad you thought the idea was good. I may carry on working on it if there is any interest.