I really like the amount of upgrades that are available for each turret but I couldn't tell if they worked when I got them, rocket launcher also pretty op lol, and i couldnt see the invincible theme, but it was fun
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It was supposed to show when you click on the enemy but after wave 5 there will be some enemies picked randomly from the invincible pool and you will get only them and the basic ones for the rest of the game so its more replayable and the theme is so that some enemies cant be slowed, some cant be stuned and some cant take magic damage or psychical.