Solid starting point. Nice art and chill music.
I personally do not like randomness in getting seeds. It would be better if the price for each was set (it can scale, depending on various factors), or at least an ability to keep seeds so as not to plant them immediately. Cause being, that right now there is little point in removing plants.
If you plan on working on this game after the jam, I would suggest adding more interactions between plants and between plants and enviroment. Something that would not be immediately apparent, require experimentation and interesting to discover. Loop Hero is a great example.
Also, cactus is bad. That makes me sad. Change it and make it viable. =)