Hello. Yes, the boss is relatively hard (actually a reskin of the stage 3 boss). I recommend saving up the bombs and using them to get rid of the harder attacks. You can dodge the 1st and 3rd attacks relatively easily by just moving lightly sideways (see the timestamp). Indeed, shoot-'em-ups are a niche genre so do not worry if you're bad at it! I myself am still pretty bad at them. Thanks for playing regardless!