Wow, thank you so much! That's incredibly high praise! I did have quite a few ideas on where I was going to take this that have been left unimplemented like a third type of point that rewards plants living across ticks, running multiple simulations simultaneously, sidegrade/replacements to certain plants that would essentially give you different loadouts, and as you have suggested, some kind of metaprogression where your starting runs become stronger etc...
Thanks again for playing the game and for your kind words!