thank you so much for trying my engine
the saya sprite , well i found it on internet
also if you complete your game i will contact my publisher and ask him to publish your game and also will advertise it
anyway keep us updated with your project :)
looks good also i removed bg using https://www.remove.bg/
and it works fine now
also you can contact me on discord if you like me to help you on anything my username there is "hanicraft"
no need to worry i made your sprite transparent https://filebin.net/bno8bobjb7bwx1by/angrybird_backgroundremoved.zip
if you need help feel free to comment here or reach me on discord