Just completed it, short and sweet :) (there are just the two levels right? or did i miss some?)
Congratulations on completing your first game/game-jam! This was my first game jam too!
A few pieces of feedback I could give (bare in mind, I never played the original SkyRoads game, so if all these things are this way because you were trying to remain true to the original game, then perhaps ignore me):
-I felt the most fun parts of the game was when I was going fast; however that also made the game much harder; I found the easiest ways for me to complete the levels was to slow down and jump carefully (but who wants to do that?! :P). I'd suggest giving the player and incentive to go fast, as that's when the game was most fun; maybe you could make the player get to checkpoints in a certain time; or maybe their score for the level is based on how fast they beat the level, so you could make it a speed-runner game of sorts.
-Stiffen up the controls a bit: the spaceship feels a bit slidy/slippery to control, which is why i had to slow down a bit. At times it was cool when i was going fast and jumped, slid across a platform and made another jump all without slowing down; but at other times it felt frustrating that i couldn't turn in time. I'm guessing you used forces to move your rigidbody on the character? Perhaps consider using rigidbody.velocity (which will make it very snappy and no slide); this depends on the kind of game you want to make though :) I think a good compromise would be to have snappier controls, but a boost function which makes you lose control a bit but lets you go faster; but again, this might be making the game quite different to the original game.
-More levels ;) The first level took me a little bit to get used to (you could make it easier to allow the player to get used to the mechanics first), but after i did I found the second level easy enough to get through; and then I was wanting more :) haha.
Hope this isn't too much text; well done on completing your first jam! *hi5*