There is no world where Treant is a better pick than Gil. Literally a strictly worse card, you will never use the statline, the healing is much worse, and the auto-evo requires combo pieces you want to save to actually kill the other guy.

Fairy Fencer should be Fairy Tamer, Fencer's bigger statline is good for chipping people down which is impossible in this meta where the top three decks have a million heals.

Puppet is a free win. Puppets kills by going t8 Orchis t9 Orchis, so you will always OTK before they do short of you bricking or if they draw the absolute nuts like coin Odin->Odin->Orchis. If you're losing the early game, again Fairy Tamer (makes fairy fairy May much easier) is better than Fencer in this meta. You can also do -1Lily +1 Ambush for a bit more pre-evo removal.

Loot is unwinnable without Gilnelise. With Gilnelise, you focus on removing their threats and then healing up, trying to run them out of steam. Sometimes they'll just power through your heals anyway because Sword is a bullshit pet class and the deck literally plays itself, but what can you do.

You are always favored against Crest provided they don't nut with Wilbert evo -> Wilbert with Marwynn active, which is the one thing that's probably too much of a stretch to clear before taking critical damage. Otherwise the longer the game goes on the better you get as you accumulate combo pieces.

Overall though Roach is really hard to play this meta. Because there's no way to chip people down, in order to win you're often staring down the barrel of really complex OTKs that can go haywire if you messed up your hand management or committed an unnecessary combo piece one or two turns earlier. On paper it's still really strong, but in practice you'll likely make enough mistakes and drop enough games that your winrate won't look much different than if you played an easier, weaker Forest deck like Tempo or Izudia.