This is pretty addicting. It reminds me of this mini-game in Super Mario 64 DS, where you use a stylus to hit a shell into a group of shells to rack up points. I'm glad you decided to make such a similar game; I liked playing that mini-game.
Anyway, the graphics were pretty nice, and the dinosaurs and planets contrasted well with everything else. I also thought your coding was pretty impressive as well (it's pretty hard hitTesting irregular shapes and circles). There was a small glitch though. If a dinosaur was coasting along and went slightly into the boundaries, it would rotate around in circles. This isn't major, though, as a gentle nudge would move it out and stop the excessive spinning. I'm only reporting this because it happened about three times in the total of four games that I played.
In short, Solarsaurs is a good time-waster that is eyecatching, and fun to play. The music was also pretty catchy as well (hats off to Bad-Atom). Well done. Now when can we see a new Blue Rabbit game? ;)