This is a very promising demo. The aesthetics work well with the music, and the combination of shmup and clicker/idle game isn't something I've seen before. Well done! I'd be interested in seeing a more developed version of this.

(Also, always nice to see a native Linux build.)

The bottom of the game's UI/screen gets cut off for players with the ever more popular 21:9 ultra-widescreen aspect ratio monitors. Could you please fix that or allow the window to be resized? Thanks!

Very neat game. Although the control's plenty intuitive, the presence of a tutorial definitely helps. I especially love the polished touches here and there, like how sometimes tiles lights up or how the resources meanders about.

If there's a low-effort thing I would add, it would be some dialogue / narration as you fight the boss. Just a dialogue bubble to urge you to quickly finish him off / give context to why you are doing this / even some humor like nagging you when you damage the shields instead of the boss.