Swift Warden in the side for lots of spot removal seems good, and Shapers of Nature vs decks that need a longer gameplan. Deeproot Warrior is hard to block in the early game, but your deck seems better (more draw) without it.
River Heralds' Boon seems great as well, can make your 1/1 a 3/3 as it can target the same creature (as long as it's a merfolk). Your 2/2's can dodge common spot removal this way and you can use it as a combat trick either way.
Deck seems allright, not made for longer games though, so best push through damage where you can.

I would toss some number of un summons and negates in the side. But looks good. Seems like dinos might be the hardest match up for ya

Vineshaper Mystic certainly should be in here over some Jade Bearers and Riverwise Augurs. I would definitely cut Ipnu Rivulet as well

Thank you for your advices, I've changed the deck a bit and added sideboard. I prefer Spell Pierce over Negate as it should suffice in most scenarios...Of course, I'll swap them if needed :)