Yoooooo, its so brilliant!!! I loved all - art is amazing, also character is so cute and nicely animated. I really like combination of music and gameplay - it fits 10/10. This game really reminded me "Tiny Toon Adventures: Buster’s Hidden Treasure" on Sega Mega Drive from my childhood, its really cool like this game.
Also i found some bugs. First one - if u try to jump under platform (like on screen) u will stack and game, as i think, will crash after all. Restarts with shift didnt happen and also page with game was lagged.
The second one - if u try to use "shift" to restart game when u didnt die it will restart level, but not the player - so u can use it like exploit to get extra time (like on gif below)
All bugs didn't interfere me to play and enjoy the game, so dont worry <3
You did really good job, this game so nostalgic for me and at the same time so fresh, that i would like to play it on polished version. Good luck with this project!