Yep, covered in glitches :P
It's definitely great for your first game, I believe this is one of the best first games I've seen :). I'm just happy it's not a maze game using the mouse or a dress-up game :P.
Animation was quite smooth, although at times I went through platforms and started falling down when I wasn't supposed to. Still, not too bad animaton, with a good game engine as Coop83 said. Graphics weren't too good, TBH. Platforms were just black blotches and occasionally black squares, the dot seemed to change in every level except towards the end where it remained the same, which was wierd, and there was no background; instead a bland white screen. Try something gradient for a background, or maybe try drawing a space background or something. Just please take away that awful white. :\
The concept, obviously, isn't that original. A platform game played with oversized dot. Also, as Kirbyfemur said quite clearly, there were loads of bugs. For example, sometimes, when you fell down, you kept falling down forever, and this would result in having to restart the game. Also, at level 10, right under the platform where the portal was, there was a little passage which you could enter, and if you jumped, you'd be teleported up to the top of the platform. Oh, and at level 15, the music decided to stop. D: I would mention more glitches, but it seems like Kirbyfemur covered the majority of them :P.
The gameplay was alright; a little awkward because of the glitches, but still OK I didn't like how the game's levels progressed, though. Level 1 was harder than 2, the one with the broken spikes (I think it's level 7), although it made me lol, was practically one of the easiest. Some levels were creative, but there was nothing which was new to platform games like these. Oh, and I liked that you had the preloader letting you move the dot around while you wait, but I didn't need to wait for that long so it wasn't such a useful feature :P.
The game overall is quite short and easy. You could either do longer levels, or increase the amount of levels to something extraordinary like 100, leaving the gamer to think 'Man, when will this ever finish??'. Also, maybe you could add bonus levels, like ones with a timer, ones where you have to find all of the pickups, etc. Also, the menu button was a little wierd, since I thought it was a platform, I jumped on it, and fell to my death :P. I'd rather you put it up to the top left corner, and made it so that it moved with the camera. This would help a lot in longer levels (if you add any). Either that, or you add a pause screen.
Also, regarding the end, where you said 'Try to finish the game always bouncing'. This gave me an idea. Maybe when you win the first 15 levels, there's another game mode where you have to do it always bouncing, and it automatically bounces your dot up and down for you, then another one when you win the bouncing mode where you have to finish the game with the left and right keys inverted, and another with a timer afterwards, where you have to win the whole game in like 2 minutes or something, and then another game mode with all of those other modes combined or something. It'd really make the game longer, if you're not aiming for increasing the amount of levels.
Not much to say about the audio. it had a good song (which disappeared at level 15 as I said before D:) and I liked that you had a victory theme at the end. What you could do is add a different song for every game mode (if you add any), since the size of the file is quite small, and I don't think it would do any harm to add some more songs. Also, the preloader 'minigame' does need an excuse to be played more while the game is loading :P...
It's an OK game, and really great for your first. Work on those glitches, the graphics and the game itself: maybe giving it some game modes and stuff. Still, not a bad job overall, keep on going at this rate and I'm sure you'll become a great flash animator. Sorry for the awfully long review... D:
6/10
3/5
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Reached the character limit, in case you want to know :P.