TL;DR I really enjoyed it !
Detailed thoughts :
At first I was a bit confused why I could pick up the coin but not the other objects, then i saw the coin counter and it made sense. I really struggled on Cookie, especially when the sound attacks are all close to the ground, it felt unavoidable and unfair. Then I persevered and I realized, like in good old gameboy games, that you definitely could avoid it if you saw it coming and moved exactly the right way !
Then came Cream, which was really fun ! My only small gripe is the items were sometimes so fast and grouped together that you were forced to take damage, but it happened quite rarely so that's okay. I liked the chaos ! The fact it sped up at mid-life took me by surprise (even though since Cookie also had a change at mid-life I could have seen it coming) and killed me a fair few times.
After many many tries, I finally managed to beat the game and it felt great !
I loved the sprites and the cuteness of the characters. The music was cool, engaging and not repetitive, which is a big plus when you're dying in a loop !
Great job, I had a great time ! :)