Overall, this looks good. I'll leave most advising to people that work with green decks, but a couple of land ideas that you may or may not consider since 2x Treetop Village may be all of the "tapped lands" that you'll want as an aggro deck. Just an idea in case you want to have a little more than just forests in your landbase.

Hashep Oasis won't enter tapped, but will cost life if you're using it for green mana (which is fairly common considering your devotion to green). It's up to you if any life-loss is worth being able to use it as a "finisher" while in topdeck mode, but I think your deck is more resilient to life loss since it's trying to race the opponent quickly.

Llanowar Reborn/Oran-Rief, the Vastwood could allow for more +1/+1 counter shenanigans but will slow you down as they enter tapped and only work as a creature is entering the battlefield.

Sapseep Forest could offer life-gain for matchups against very fast decks (i.e. burn) after you establish a board presence. It's pretty slow for your deck, but maybe you could consider it.

Thanks for the suggestions! I don't know if it would be a good idea to dilute the mana base with all of the devotion to green and Dungrove Elder. Maybe Sapseep Forest could be decent in the sideboard against control decks because this deck doesn't do well in the long game.