First off-this game is obviously bad and janky, no disagreement there.
But this game is also very easy, and every enemy encounter is pretty trivially defeated by just... basic kiting and circle strafing. The enemies minus the dog have no answer to a player who slowly backs away from them while stabbing them, and in the rare case you don't have room you just circle them instead. And ammo is common enough that once you've gotten some damage upgrades, you can just magdump into anything remotely dangerous(like the game's one and only "boss").
Your weapon unequipping if you get fucked just means you tap the number once you're out, which doesn't really make things harder. But more than any of that... "Having to right click to use your weapon is unnecessarily troublesome especially for an fps game"? Right click to aim is normal for most fps for decades at this point, even more normal for third person shooters like this, and is how shooting works in Resident Evil games which this is obviously cribbing from. (As well as the "aim with a laser sight and no reticule", which is from RE4.)
The game sucks, but it's not the cheap hentai game's fault that you're clueless.