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> Perhaps that could be a way to earn extra owls though !

Ah, but there is! 

Bonk 10 Beaky Birds and a heart will spawn, catch it to heal 1 heart. 

Bonk 50 Beaky Birds and an owl egg will spawn and hop across the ground.  Go catch it to earn an extra life!

> Not that I really know if you are interested in updating this game further,

I'm always up for hearing ideas and improving my games!

oh, but I mean like, extra characters, not 1ups :3

Honestly, you are probably one of the few people who release post-jam improvement builds, so there's that!