Cool game. I like the safe zone and that you just need to get started from there. picking the right moment to start was a fun challenge.
Some music and sound effects would do a lot to make the game feel more finished. Plus a visual or audible indicator of the shield timer.
I was not able to test the multi-player function, but the idea of a race against an opponent is really cool and ads a lot to the fun of the game.
This game gas a lot of potential. Good job!