Looks interesting but for this type of game A BIT overpriced. I would suggest 10 €. Am I wrong?

This game has a bunch of content, i have played it for 10 hours already, and completed it atleast 15 times
Lets compare it Crimson Clover which i also played on GOG

First Caladrius Blaze:
- 8 different Ships with their unique Attacks, 3 Skills, Bombs and Special Attack (Original Mode)
- 6 or 7 levels depending on Game Mode, also 2 additional "Special" Levels with a target
- 6 different levels of difficulty, and 5 Game Modes

Now Crimson Clover:
- 3 (+1) different Ships with their own Attack, Ability
- 5 Levels
- 2 difficulty Levels with 2 or 4 Game Modes (Depending on Difficulty)

Additionally Caladrius Blaze has a Story for each Character, which Crimson Clover unfortunatly lacks

Since its double the content Crimson Clover has, for double the prize i think its fine :)

Also dont forget you can get different dialogue depending on which characters you group together in syncro and/or coop modes. And thus replayability goes through the roof. So no i dont think its over priced.
Not one bit.

The launch discount expired thats all.it was 10% off.
Personally ive been having buckets of fun with this to the point of placing it in my top 3 shoot em ups, the other 2 being Astebreed (also available here) and anything Touhou 6+.