Slow shmups aren't really my thing, I like fast ones (primarily bullet hells) however.. This is not just a shmup, it's puzzle game influenced shmup! It may remind you a bit of Bejeweled which is a game I grew up playing. I did 2 stages of this game to give you a good idea of it, if you like what you see.
Get this game on Steam like I did: http://store.steampowered.com/app/375120/