The graphics are really smooth and nice. For the gameplay, the basic idea is really great, it's just hard to understand how to use it especially on level 2. I made it to the flag but the robot died after because he goes too far on the right of the screen.
One improvement that i can see is to keep the loop that i the user made between try, because i want to tweak value but i have to rebuild the whole loop at every try. Another thing is maybe to don't have to type value for speed or force but have a slider instead.
I'm sure that with some small fix this game can be really good ! The basic gameplay idea is really creative and can be really fun.