Considering how bad this game's problems are, not many words need to be said about it.

The game itself seems to be pretty nice, but the issues with how badly it runs on even high-end hardware renders it nearly unenjoyable.

As for some in-depth ranting...
I suspect it is so poorly programmed that it is single-threaded and doesn't do caching, which means the game hangs when it needs to load stuff off your HDD.
Or busy handling new situations...
... and that happens a lot and seems to be getting worse the farther in you get.
Can you imagine a game dropping to less than 5 FPS or even becoming unresponsive when loading levels or going back to the map? How about even when you use a special power or start a new wave?
Just put a couple of hours into this game and you get it. Please do note that I played it off an HDD and not an SSD, which should alleviate the problems somewhat. But I'm not gonna bother now that my cards dropped.

And yeah, the amount of CPU capacity and RAM it occupies is negligible on my pretty-high-end pc

Considering how bad this game's problems are, not many words need to be said about it. The game itself seems to be pretty nice, but the issues with how badly it runs on even high-end hardware renders it nearly unenjoyable. As for some in-depth ranting... I suspect it is so poorly programmed that it is single-threaded and doesn't do caching, which means the game hangs when it needs to load stuff off your HDD. Or busy handling new situations... ... and that happens a lot and seems to be getting worse the farther in you get. Can you imagine a game dropping to less than 5 FPS or even becoming unresponsive when loading levels or going back to the map? How about even when you use a special power or start a new wave? Just put a couple of hours into this game and you get it. Please do note that I played it off an HDD and not an SSD, which should alleviate the problems somewhat. But I'm not gonna bother now that my cards dropped. And yeah, the amount of CPU capacity and RAM it occupies is negligible on my pretty-high-end pc