Trust me, my PC specs are fine. What causes problems is the amount of models being rendered simultaneously. Of course I over-exaggerated the problem when it comes to the exe (even if 'tis noticable even there, and that's what I meant)
I get that the enemies are meant to be weak because of the theme, but in that case the theme could have been executed better and/or differently because at present the enemies might as well not be there, and their upgrades might as well not exist since they don't really do anything
Overall, don't take this to heart. The game's neat for what 'tis worth, even if it devolves down into brainless button-mashing due to its nature