Thanks! What hardware are you using? The game is quite heavy despite its simplistic looks and there's little I can do to improve performance considering how Unity works. Let me know which parts of the UI you found cumbersome; there are many shortcut keys to operate it.
From what I can tell, people who find critters to be tanky, are not making proper use of power shots, especially when using pistols which are the weakest weapons damage-wise. I encourage you to join my discord channel to discuss further your feedback - the game is actively under development, even though I have left its full-time development. Cheers!