For a 3hour submission this is quite impressive so take my improvements as post jam suggestions rather than criticisms!
I love this approach to the reverse flappy bird concept, having it nature themed and moving trees around is quite unique!
Some improvements I would have made would be to have variance in SFX (it can become quite repetitive otherwise) even just dynamic pitch shifting would help.
Some variance in different tree sprites would also add some diversity, maybe having the biome shift as you play for longer :]
Cute short little game!