Pretty cool game. Nice and simple and works well. Good job!
The only point of feedback I have is maybe use a more contrasting color scheme next time. I'm colorblind and while I could still tell the difference between the red/green in this game, there are others who are worse than me and might not be able to. Red/green is a common colorblind deficiency.
Anyways, not a huge deal. Still had fun, good work!