I thought this was a really fun idea! I got pretty far on 2 playthroughs , but they both ended due to getting stuck on a rock / my own path. But I had a lot of fun up until those points. Deciding if I should shuffle my deck so I can try and work my way towards a coin, all while the water was rising, was a really nice tense feeling.
I think with a few fixes and additional collectables, this could be a really good proper game. There's a definitely a strong foundation here. And the music is really great too, there was a slight hint of Sonic 3 Lava Reef vibes. Well done!