If you not even get a thirdeyes part yet, which is low level common thing. I recommend don't get thirdeyes that earlies.I t a nightmare to up it in the higher levels. trust me, i'm level 52 rn and my third eys only damage 71 cus i get it too early
I hate the upgrade now cus it cost depend on the level, so you can't upgrade it like 1+, 1+ damage. Kinda terrible. And the armor upgrade is sooo bad that i even saw people who level 50 have full set gun but wodden armor cus it's terrrrible
The reason why people use 3 cat spam because if you are good enough, you can kill an opponent within 1 sec. I drop the game for a while because i reached that level where i can clean all people who get in my way and that is pretty boring.