Press the green flag. BTW, if you are using the on-screen arrow keys in the game (which I don't recommend you do because it sucks), you will have to keep on spamming them to move Lexie. Most of the instructions are in the game. This game was for a science project, so this was a little rushed.
Me for most of the drawings and coding. @DolphinLadeeda for help me with technical difficulties with the scripts. @Bakedpotatobelly for designing Lexie's face..