Great game! 1 thing though

Very good game without any bugs, great graphics, but it would be better that we could use powers optional, like comet showers or freez blast should be collectible and be used by user in the right time, same for other dragons or hearts, they seem wasted and useless when they apear in the worst time possible , speccialy when u pay to upgrade them alot
Thanks! For ur beautiful game:)

Gray Snowflake about Dragon Hills, v1.2.0