The Blockly interface included in Aseba is pure event-based. It is a transcription of the Aseba text into blocks. In this pure event-based or reaction-based environment, there is no mean easy mean to have "go forward 10cm" or "turn 45°".

But, now a Scratch link has been developed and is ready to be used. I let you go on this page: https://www.thymio.org/en:scratchprogramming. With this programming environment, you have access to all these blocks such as "move 10 cm"… This is a brand new add-on on Thymio, you may find one or two things that are not perfect yet. If you do, please refer to them either here on the forum, or on the Github link here: https://github.com/davidjsherman/inirobot-scratch-thymioII/issues

Have fun discovering this new feature!