Just in case I was playing the browser version on Chrome:
1. After you see the text that says you finished a trail, the character can still move. usually, in that type of situation, you would not be able to move.
2. in this part, the camera doesn't work right, it moves down and it was very confused the first time It heppened and couldn't see my character for a while:
3. I think the wall should have a different color to make them look different form the background, it just looks off to me and I bit confusing, but if that's the look you are going for, that's ok.4. You can't take keys when you are hit, maybe that's not a problem, but I found it funny that it was not possible.
5. for some reason you can't break the wall with the fireball if you are too close:
6. I didn't record how I got the snail there, but I literally just pushed it there by holding right.7. Also I noticed that some button in the controller would not work unless I remapped them.