Pretty fun for a few minutes. I felt like the theme implementation could have been better. The second character doesn't do a lot, so you're not really working together. The special object implementation is good tho.
The game was quite fun for around 3-5 minutes. The gameplay could have been better in my opinion, because it was very hard to control my character. If I held left or right for a fraction of a second too long, I got launched into a spike. I also randomly died one time, but I'm not sure if that was a bug or not (and it only happened once so yeah it wasn't a big deal).
I personally prefer music over sounds effects. This game only contained a sound effect. I wasn't a huge fan of it, honestly. But I think with a few adjustments it could sound better.
The graphics felt simple, and there's nothing wrong with that in my opinion. It just wasn't anything exceptional.
I hope this feedback helps you as a developer! Overall I saw you put effort into the game. That's the most important thing! Good luck with your future creations!