so far its no fun, but the general idea is interesting. so keep working on it
I'd say more or less the same thing - maybe 'not very fun' rather than 'no fun', but there's certainly potential.
I have one question, and two suggestions. Firstly, is it intentional that clicking more or less anywhere prevents you from falling and gives you a little boost upwards? It made it not very hard to avoid death, one just has to click and hold on asteroids only for a little bit to avoid building up too much sideways momentum and adjusting oneself into the right X alignment, then falling onto the gems and clicking back up, or vice versa.
One big suggestion I would make would be to introduce parallax on the backgrounds, otherwise it's very hard to judge speed when there's nothing else visible on-screen. Unless that's intentional, since it's probably the case in space?
The other would be to increase the diameter of the clickable zone for asteroids, unless you're aiming for this to be a mobile-only game in the long run. Clicking precisely on tiny little round things can work on mobile 'cause people are directly using their actual fingers, but with a mouse pointer and mouse acceleration and hand-eye coordination being broken across two separate divides and all that, it's much harder on the PC, and it can be pretty frustrating to miss something you thought you'd got because your hastily-moved mouse was slightly out of position.
...I can't count, OK? I'd also suggest rather than having a big red floor, draw a boundary so-far away from the ship in every direction, and fail the player if they stray too far. If nothing else, there's presently a somewhat annoying situation where you move too far to the side to be able to see any asteroids to click on, but haven't fallen and died yet. It's possible to stay alive by clicking continuously or click-and-holding, but you can't do anything else. I'd suggest it's bad form to have a fail state which requires the player to commit suicide to proceed!
Also why is gravity acting upon the player but not the asteroids and gems? :3