Great game but it could have a little more to it.
1. More game modes. Maybe an endless run or a challenge mode of some sort.
2. More powerups. Most generic ones come to mind for me right now like having good ones like slow-mo for a few seconds or more points and bad ones like speed up (because it's not fast enough), more obstacles, etc.
3. Leaderboards. Enough said
4. Multiplayer. I don't know how difficult it is to implement but it would be interesting to play against other players not only by yourself. In turn it would be pretty cool to have different multiplayer modes too like having a track instead of random obstacles, etc.
5. Different color scheme or better yet, ability to change the colors. As someone mentioned earlier sometimes it can be difficult to see.
6. More UI options. Mute, quality, all that normal stuff that exists in other games.
I'll be looking forward to the updates of this game and I may or may not buy it once a full version is out. We'll see :)
