How the cannonballs gently bump into the character is quite fun to me. The graphics are cool and the music fits well. After collecting lots of gold coins, suddenly having to collect silver coins instead felt a bit harsh (why did I collect those gold coins?!). Some of the silver coins were out of reach (am I supposed to climb on a cannonball for the one on the top right?), and having already explored the level to get the gold coins, collecting them felt a bit grindy.
Overall, really nice game, thanks for creating it!