That last round is very hard, I think there are very few options to be able to beat it, but I beated it. It's a very cool idea, but I wish the upgrading cycle were between waves, upgrading towers in the middle of the battle also when you don't know what's comming next wave is a bit overwhelming, in my opinion the threads should appear before the wave begins and in the "upgrade" phase so you would know were to upgrade first for a better strategy.
Overall very good game and very addicctive, even losing like 10x I kept playing until I could win it!
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Yes it is too hard. And I think it would be easier or maybe even a better design to separate the building time and threads but I consider the spinning threads and having to build and control the waves at the same time the double duty. I also didn’t want to bore people either. Glad you kept playing until you claimed victory!