I recently beat Downwell so naturally I had to give this a shot! It's a cute homage, I like how you used the 3-color palette.
If I had to make a criticism (which hopefully will help because it sounds like you're developing it further!) I felt like I got the hang of it really quickly and difficult wasn't really increasing when I set my high score about 1200m. Are you going to give it different levels and a boss like Downwell? :)