Yeah the lava it's incremental and the plant too. One of the points of the Jam it's the innovation
The plant grows and the lava level goes up, but that doesn't make it an incremental. Its a platformer game without any incremental game mechanics.
https://en.wikipedia.org/wiki/Incremental_game
So then what make a clicker incremental. The points or clicks you have increasing are an incremental mecanic like the lava or the plant. Anywhere I hope you enjoy the game.
About the wiki there are games that don't follow the genre exactly.