Just came back from the two week hiatus. I'm willing to catch up on finishing the daily grind.
Update: (05/27)
I found a game breaking bug: if you pickup the bullseye perk, then it will hinder the game's performance. What this means is, the framerate dips from time to time and gets lower every several seconds. Whatever you do, do not pick the bullseye perk. Avoid it at all costs if you want a stable 60+ FPS.
Another game breaking bug I found is: the enemy speed seems to increase depending on game's FPS. If 60 FPS, then the enemy speed is default; however, if going higher than 60, then the enemies move faster than the player.
Update: (06/14/24)
The developer is aware of the issues after reading my thread regarding the game breaking bugs.
Previous notes:
I originally thought it was switching window and pausing that causes the performance, but I later found out it wasn't the case.