It's fun and I'm really glad you posted an executable because when I read "first game" and "unity" I half expected some bloated monstrosity. This was pure game. Spot on graphics, sound and music. If you would hear my advice, it would to make environment interactions, like taking damage, more readable. I had my friend with me and I felt like I was about to walk right into a spike, but there was a dome between us, and hence distance, but I suddenly respawned, without my friend. Only ever got 1 friend showing even after the next was freed and I got a game over with like 2400. I found the coins (cookies?) spawned too close to the edge which meant certain damage.
Really loved the crisp graphics and solid physics. Hard to see your collaborators, the music was super chill, could you try a more legible font, or hyperlinks?