yeah..... it is a little tooo repetitive. Make everything smaller. Add in some upgrades, the need to dodge needs to improve, and more types of enemies. And you would have a fun game here.
It doesn't require much skill to play, as I suggested, it might be nice to have a time warning and make the time bonuses worth less. Just a suggestion.
Wait.... that's odd. I just picked up another Amethyst and it said I still had 2. I think there is a slight glitch there. It allowed me to upgrade now. Seems like the count of items can be messed up.