Completed the final round with 2 seconds left.
Colors pop well and feel attractive. Variety in berries is a nice twist to traditional snake game. Music is a nice choice too. The levels felt different enough from each other while also presenting a challenge without making it too difficult.
I adapted to the input layout by rotating the game view inside my head (pretend I was looking from the side) so the controls made perfect sense. You could try experimenting with WAD keys for moving forward, turning left and right on local axis. This would reduce the inputs to 3 keys while also changing the way players see the game. A lot of casual players may not spend much time or effort trying to adapt to a new/different perspective
Due to the time limit, I could not pay much attention to the berries on the combo list. To help make it easier, you could probably change the size of the berry icon on the top row in such a way that whichever berry was expected next, that one would be slightly bigger (or change its background color or something about it different enough to stand out a bit) so the player attention could easily go to it when looking up there. Once that berry is consumed, you could make bigger/different the next icon on the row.
Do you plan on releasing an Android version as well? I think it has good potential for the mobile market.