There's now a warning sound* playing and the HP bar turns red when your monsters' HP are dangerously low.
(* It just plays once, I don't like the constant beeping in the early Pokémon games either!)
I moved the symbol indicating the effectiveness of a move closer to the moves's type icon and made the type icon glow to make it more clear what that symbol means.
There's also now a rainbow star icon next to the monsters' level if that monster is a Shiny.
Speaking of Shinies...
You can now view shiny variants you've caught in your Abstrácto-DEX! The same star icon marks monsters whose shiny variant you've cought. When viewing the detailed info of a monster...
...you can now switch between its normal and shiny form. Neat!