Decent so far...
So far, the game was nothing special. However, it was great for the file size. Some things that you might want to consider for the final version are:
1. Adding various bonuses. You could add a speed boosted that either makes you go faster, or makes the avalanche go slower, a jump booster to make you jump farther or make you spend more time in the air, and some sort of coin that increases your score.
2. More tricks. The spinning thing is a great addition to the game. You can expand on that and add more tricks. For example, you could to a somersault-like trick, a trick that requires a key to be pressed at the peak of the jump and then something happens. If you have more than one trick, you can also have combination bonuses for performing more than one trick at a time.
3. More and different obstacles. For example, you could make moguls. If you go directly on a mogul, your speed is temporarily decreased. However, if you go just to the side of a mogul, like you're supposed to, you gain points. You could also make different-shaped rocks, trees, etc.
4. Add jumps. When you go off a jump, you get more air than you usually do while jumping. If you spin off a jump, you can do a 720 and get 100 points instead of 50. If you add more tricks, that could make the jumps more useful.
5. Add other skiers. If you want to keep it simple, they just ski in a random path, and hitting them will either take down your health or slow you down. If you want to make it more complicated, they can also jump over rocks and be caught by the avalanche, and they try to knock you down. Maybe there is some way for you to knock them down, in which case you can gain some points.
6. Add some slalom-like flags. If you pass through them, you get points, instead of having to jump randomly to gain points. You could make them appear randomly like rocks, and put blue flags to indicate where they will be, like the yellow flags indicate where the rocks will be.
7. Add difficulty levels. It can get kind of boring if there are not a lot of rocks on stage at once, and there isn't much visible change in the frequency of rocks/level. You could add a easy/medium/hard difficulty selector that controls the speed of the avalanche, and a low/medium/high selector that controls the frequency of the rocks.
Overall, this was a very good game for a beta version without sounds and a menu for such a low filesize. The one main problem of the game was its monotony. Some monotony is good and addictive, but if it takes a long time to die, it's boring instead of addictive. Adding jumping/landing sounds and such will definately improve it significantly. If you change the pace of the game a little, I'm sure that it will get a 3+ score.