I really enjoyed this! I really liked the way you handled the three-color restriction. The music was nice, but got a bit repetitive.
I didn't play through the whole thing (I discovered 5-6 plants), but this is impressively long gameplay for a jam game. I liked discovering the different plants.
To answer an earlier question, the HTML5 version is working fine for me. It did take me a while to realize you need to click on the checkmark to use items, though.